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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, 2018
Jan. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]    
Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) $ (21.0) $ 12.1
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) (13.0) (4.9)
Foreign Exchange Forward [Member] | Cost of sales [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) (6.3) (1.5)
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [1] 0.1 (1.5)
Precious metal collars [Member] | Cost of sales [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) 1.0 0.0
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [1] 0.3 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) 4.2 14.0
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [1] (0.9) (8.5)
Currency Swap [Member] | Other (income) expense [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) (19.9) (0.4)
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [2] (11.1) 6.6
Interest Rate Swap [Member] | Interest expense and financing costs [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) 0.0 0.0
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [3] $ (1.4) $ (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.
[3] The gain or loss recognized in earnings is included within Other (income) expenses, net.