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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
Apr. 30, 2016
Apr. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Pre-Tax Gain (Loss) Gain Recognized in OCI (Effective Portion) $ 8.0 $ (4.1)
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) 0.4 2.8
Foreign Exchange Contract [Member] | Cost of sales [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Pre-Tax Gain (Loss) Gain Recognized in OCI (Effective Portion) (13.9) 1.0
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [1] 3.5 4.2
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) 21.6 (5.1)
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [1] (2.7) (1.0)
Precious Metal Collars [Member] | Cost of sales [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Pre-Tax Gain (Loss) Gain Recognized in OCI (Effective Portion) 0.3 0.0
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [1] 0.0 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
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) [2] $ (0.4) $ (0.4)
[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.