Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT (Schedule of Long-term Debt) (Details)

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LONG-TERM DEBT (Schedule of Long-term Debt) (Details) - USD ($)
$ in Millions
 9 Months Ended
Oct. 31, 2015
Mar. 09, 2015
Feb. 23, 2015
Jan. 31, 2015
Debt Instrument [Line Items]        
Long-term debt $ 8,486.2     $ 757.0
Unamortized Premium or Discount and Debt Issuance Costs 142.7     74.3
Senior Notes        
Debt Instrument [Line Items]        
Long-term debt 0.0     750.0
Unamortized Premium or Discount and Debt Issuance Costs 0.0     3.3
Senior Notes | 5.25% Acquisition Notes, due 2020        
Debt Instrument [Line Items]        
Long-term debt 750.0   $ 750.0 0.0
Unamortized Premium or Discount and Debt Issuance Costs $ 11.7     11.9
Senior Notes | 5.25% Acquisition Notes, due 2020 | LIBOR        
Debt Instrument [Line Items]        
Effective percentage 5.25%      
Senior Notes | 5.75% Acquisition Notes, due 2023        
Debt Instrument [Line Items]        
Long-term debt $ 2,500.0   $ 2,500.0 0.0
Unamortized Premium or Discount and Debt Issuance Costs $ 41.3     39.8
Senior Notes | 5.75% Acquisition Notes, due 2023 | LIBOR        
Debt Instrument [Line Items]        
Effective percentage 5.75%      
Unsecured Debt        
Debt Instrument [Line Items]        
Long-term debt $ 0.0     0.0
Unamortized Premium or Discount and Debt Issuance Costs $ 0.0     0.9
Unsecured Debt | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.90%      
Effective percentage 1.09%      
Forgivable Promissory Notes        
Debt Instrument [Line Items]        
Long-term debt $ 7.0     7.0
Unamortized Premium or Discount and Debt Issuance Costs $ 0.0     0.0
Forgivable Promissory Notes | LIBOR        
Debt Instrument [Line Items]        
Effective percentage 1.00%      
Term Loans | Term Loan A        
Debt Instrument [Line Items]        
Long-term debt $ 987.5 $ 1,000.0   0.0
Unamortized Premium or Discount and Debt Issuance Costs $ 3.8     0.4
Term Loans | Term Loan A | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable rate 2.25%      
Effective percentage 2.44%      
Term Loans | Term Loan B-1        
Debt Instrument [Line Items]        
Long-term debt $ 3,291.7 $ 3,950.0   0.0
Unamortized Premium or Discount and Debt Issuance Costs $ 63.1     8.2
Term Loans | Term Loan B-1 | LIBOR        
Debt Instrument [Line Items]        
Effective percentage 3.50%      
Term Loans | Term Loan B-1 | LIBOR | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.75%      
Term Loans | Term Loan B-1 | LIBOR | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate 2.75%      
Term Loans | Term Loan B-2        
Debt Instrument [Line Items]        
Long-term debt $ 650.0     0.0
Unamortized Premium or Discount and Debt Issuance Costs $ 12.5     0.0
Term Loans | Term Loan B-2 | LIBOR        
Debt Instrument [Line Items]        
Effective percentage 4.25%      
Unsecured Senior Notes        
Debt Instrument [Line Items]        
Long-term debt $ 300.0     0.0
Unamortized Premium or Discount and Debt Issuance Costs $ (11.2)     0.0
Unsecured Senior Notes | LIBOR        
Debt Instrument [Line Items]        
Effective percentage 5.00%      
Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Long-term debt $ 0.0     0.0
Unamortized Premium or Discount and Debt Issuance Costs $ 21.5     $ 9.8
Line of Credit | Revolving Credit Facility | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable rate 2.25%      
Effective percentage 2.44%