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Hedging Instruments - Information on Location and Amounts of Derivative Gains and Losses in Consolidated Financial Statements (Details) - Cash Flow Hedging [Member] - USD ($)
$ in Millions
12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) $ (22.2) $ 14.6
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) 11.7 13.0
Foreign Exchange Contract [Member] | Cost of sales [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) 3.9 23.2
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [1] 20.2 18.7
Precious metal collars [Member] | Cost of sales [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) 0.2 0.0
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [1] 0.0 0.0
Precious Metal Forward Contracts [Member] | Cost of sales [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) (26.3) (4.4)
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [1] (7.0) (4.2)
Forward-starting Interest Rate Swaps [Member] | Interest expense and financing costs [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) 0.0 (4.2)
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [2] $ (1.5) $ (1.5)
[1] The gain or loss recognized in earnings is included within Cost of sales.
[2] The gain or loss recognized in earnings is included within Interest expense and financing costs.