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Hedging Instruments - Information on Location and Amounts of Derivative Gains and Losses in Consolidated Financial Statements (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Cost of sales	$ 1,662.1	$ 1,631.1	$ 1,559.1
Interest expense and financing costs	(38.5)	(39.7)	(42.0)
Other expense, net	(3.8)	(7.1)	(6.9)
Other comprehensive loss, net of tax	(42.4)	(68.6)	$ 118.2
Cash Flow Hedging \| Foreign Exchange Forward \| Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain recognized in OCI	0.0
Pre-tax gain reclassified from accumulated OCI into earnings	(4.1)
Pre-tax gain recognized in OCI		0.0
Pre-tax gain reclassified from accumulated OCI into earnings		(2.6)
Cash Flow Hedging \| Foreign Exchange Forward \| Interest expense and financing costs
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain recognized in OCI	0.0
Pre-tax gain reclassified from accumulated OCI into earnings	0.0
Pre-tax gain recognized in OCI		0.0
Pre-tax gain reclassified from accumulated OCI into earnings		0.0
Cash Flow Hedging \| Foreign Exchange Forward \| Other expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain recognized in OCI	0.0
Pre-tax gain reclassified from accumulated OCI into earnings	0.0
Pre-tax gain recognized in OCI		0.0
Pre-tax gain reclassified from accumulated OCI into earnings		0.0
Cash Flow Hedging \| Foreign Exchange Forward \| Other comprehensive loss, net of tax
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain recognized in OCI	5.4
Pre-tax gain reclassified from accumulated OCI into earnings	4.1
Pre-tax gain recognized in OCI		5.8
Pre-tax gain reclassified from accumulated OCI into earnings		2.6
Cash Flow Hedging \| Precious metal collars \| Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain reclassified from accumulated OCI into earnings	(0.3)
Pre-tax gain reclassified from accumulated OCI into earnings		(0.6)
Cash Flow Hedging \| Precious metal collars \| Interest expense and financing costs
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain reclassified from accumulated OCI into earnings	0.0
Pre-tax gain reclassified from accumulated OCI into earnings		0.0
Cash Flow Hedging \| Precious metal collars \| Other expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain reclassified from accumulated OCI into earnings	0.0
Pre-tax gain reclassified from accumulated OCI into earnings		0.0
Cash Flow Hedging \| Precious metal collars \| Other comprehensive loss, net of tax
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain reclassified from accumulated OCI into earnings	0.3
Pre-tax gain reclassified from accumulated OCI into earnings		0.6
Cash Flow Hedging \| Precious Metal Forward Contracts \| Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain recognized in OCI	0.0
Pre-tax gain reclassified from accumulated OCI into earnings	2.8
Pre-tax gain recognized in OCI		0.0
Pre-tax gain reclassified from accumulated OCI into earnings		1.0
Cash Flow Hedging \| Precious Metal Forward Contracts \| Interest expense and financing costs
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain recognized in OCI	0.0
Pre-tax gain reclassified from accumulated OCI into earnings	0.0
Pre-tax gain recognized in OCI		0.0
Pre-tax gain reclassified from accumulated OCI into earnings		0.0
Cash Flow Hedging \| Precious Metal Forward Contracts \| Other expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain recognized in OCI	0.0
Pre-tax gain reclassified from accumulated OCI into earnings	0.0
Pre-tax gain recognized in OCI		0.0
Pre-tax gain reclassified from accumulated OCI into earnings		0.0
Cash Flow Hedging \| Precious Metal Forward Contracts \| Other comprehensive loss, net of tax
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain recognized in OCI	18.1
Pre-tax gain reclassified from accumulated OCI into earnings	(2.8)
Pre-tax gain recognized in OCI		(7.2)
Pre-tax gain reclassified from accumulated OCI into earnings		(1.0)
Cash Flow Hedging \| Cross-currency swaps \| Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain recognized in OCI	0.0
Pre-tax gain reclassified from accumulated OCI into earnings	0.0
Pre-tax gain recognized in OCI		0.0
Pre-tax gain reclassified from accumulated OCI into earnings		0.0
Cash Flow Hedging \| Cross-currency swaps \| Interest expense and financing costs
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain recognized in OCI	0.0
Pre-tax gain reclassified from accumulated OCI into earnings	(6.1)
Pre-tax gain recognized in OCI		0.0
Pre-tax gain reclassified from accumulated OCI into earnings		0.0
Cash Flow Hedging \| Cross-currency swaps \| Other expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain recognized in OCI	0.0
Pre-tax gain reclassified from accumulated OCI into earnings	(0.1)
Pre-tax gain recognized in OCI		0.0
Pre-tax gain reclassified from accumulated OCI into earnings		(0.4)
Cash Flow Hedging \| Cross-currency swaps \| Other comprehensive loss, net of tax
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain recognized in OCI	27.0
Pre-tax gain reclassified from accumulated OCI into earnings	6.2
Pre-tax gain recognized in OCI		0.3
Pre-tax gain reclassified from accumulated OCI into earnings		0.4
Cash Flow Hedging \| Interest Rate Swap \| Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain reclassified from accumulated OCI into earnings	0.0
Pre-tax gain reclassified from accumulated OCI into earnings		0.0
Cash Flow Hedging \| Interest Rate Swap \| Interest expense and financing costs
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain reclassified from accumulated OCI into earnings	1.3
Pre-tax gain reclassified from accumulated OCI into earnings		1.4
Cash Flow Hedging \| Interest Rate Swap \| Other expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain reclassified from accumulated OCI into earnings	0.0
Pre-tax gain reclassified from accumulated OCI into earnings		0.0
Cash Flow Hedging \| Interest Rate Swap \| Other comprehensive loss, net of tax
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain reclassified from accumulated OCI into earnings	$ (1.3)
Pre-tax gain reclassified from accumulated OCI into earnings		$ (1.4)