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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, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-Tax Gain (Loss) Gain Recognized in OCI (Effective Portion) $ 9.9 $ (1.0) $ 17.9 $ (5.1)
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) (2.7) 3.4 (2.2) 6.2
Foreign Exchange Contract [Member] | Cost of sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-Tax Gain (Loss) Gain Recognized in OCI (Effective Portion) (1.2) 6.9 (15.1) 8.0
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [1] 0.8 5.2 4.4 9.5
Precious Metal Forward Contracts [Member] | Cost of sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-Tax Gain (Loss) Gain Recognized in OCI (Effective Portion) 14.5 (7.9) 36.1 (13.1)
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [1] (2.4) (1.4) (5.1) (2.5)
Precious Metal Collars [Member] | Cost of sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-Tax Gain (Loss) Gain Recognized in OCI (Effective Portion) 0.2 0.0 0.5 0.0
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [1] 0.0 0.0 0.0 0.0
Currency Swap [Member] | Interest and other expenses, net [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-Tax Gain (Loss) Gain Recognized in OCI (Effective Portion) (3.6) 0.0 (3.6) 0.0
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [2] (0.7) 0.0 (0.7) 0.0
Forward-starting interest rate swaps [Member] | Interest and other expenses, net [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Pre-Tax Gain (Loss) Gain 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) $ (0.8) $ (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.