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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
3 Months Ended 6 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2017
Jul. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) $ (4.9) $ 9.9 $ (15.2) $ 17.9
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) (3.6) (2.7) (12.5) (2.2)
Foreign Exchange Contract [Member] | Cost of sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) (0.6) (1.2) (3.8) (15.1)
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [1] (0.9) 0.8 (3.7) 4.4
Precious Metal Forward Contracts [Member] | Cost of sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) (3.0) 14.5 (2.7) 36.1
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [1] (0.3) (2.4) (1.2) (5.1)
Precious Metal Collars [Member] | Cost of sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) 0.0 0.2 0.1 0.5
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [1] 0.1 0.0 0.1 0.0
Currency Swap [Member] | Interest and other expenses, net [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) (1.3) (3.6) (8.8) (3.6)
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [2] (2.1) (0.7) (7.0) (0.7)
Forward-starting interest rate swaps [Member] | Interest and other expenses, net [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) 0.0 0.0 0.0 0.0
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [2] $ (0.4) $ (0.4) $ (0.7) $ (0.8)
[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 and other expenses, net.