Hedging Instruments - Information on Location and Amounts of Derivative Gains and Losses in Consolidated Financial Statements (Details) - USD ($) $ in Millions	3 Months Ended
Apr. 30, 2020	Apr. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Cost of sales	$ 246.5	$ 383.9
Interest expense and financing costs	9.8	10.4
Other income, net	(25.4)	(1.0)
Other comprehensive income (loss), net of tax	(18.5)	(13.2)
Precious metal forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Reclassified deferred hedging gains resulting from discontinuance of cash flow hedge	4.2
Cash Flow Hedging \| Foreign exchange forward contracts \| Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss recognized in OCI		0.0
Pre-tax gain/loss reclassified from accumulated OCI into earnings	(0.3)	(1.1)
Cash Flow Hedging \| Foreign exchange forward contracts \| Interest expense and financing costs
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss recognized in OCI		0.0
Pre-tax gain/loss reclassified from accumulated OCI into earnings		0.0
Cash Flow Hedging \| Foreign exchange forward contracts \| Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss recognized in OCI		0.0
Pre-tax gain/loss reclassified from accumulated OCI into earnings		0.0
Cash Flow Hedging \| Foreign exchange forward contracts \| Other comprehensive loss, net of tax
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss recognized in OCI	(1.1)	5.7
Pre-tax gain/loss reclassified from accumulated OCI into earnings	0.3	1.1
Cash Flow Hedging \| Precious metal collars \| Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss reclassified from accumulated OCI into earnings		(0.1)
Cash Flow Hedging \| Precious metal collars \| Interest expense and financing costs
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss reclassified from accumulated OCI into earnings		0.0
Cash Flow Hedging \| Precious metal collars \| Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss 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/loss reclassified from accumulated OCI into earnings		0.1
Cash Flow Hedging \| Precious metal forward contracts \| Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss recognized in OCI		0.0
Pre-tax gain/loss reclassified from accumulated OCI into earnings	(4.6)	1.1
Cash Flow Hedging \| Precious metal forward contracts \| Interest expense and financing costs
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss recognized in OCI		0.0
Pre-tax gain/loss reclassified from accumulated OCI into earnings		0.0
Cash Flow Hedging \| Precious metal forward contracts \| Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss recognized in OCI		0.0
Pre-tax gain/loss 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/loss recognized in OCI	0.6	(1.4)
Pre-tax gain/loss reclassified from accumulated OCI into earnings	4.6	(1.1)
Cash Flow Hedging \| Cross-currency swaps \| Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss recognized in OCI		0.0
Pre-tax gain/loss 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/loss recognized in OCI		0.0
Pre-tax gain/loss reclassified from accumulated OCI into earnings	(1.6)	0.0
Cash Flow Hedging \| Cross-currency swaps \| Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss recognized in OCI		0.0
Pre-tax gain/loss reclassified from accumulated OCI into earnings	4.8	(7.8)
Cash Flow Hedging \| Cross-currency swaps \| Other comprehensive loss, net of tax
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss recognized in OCI	8.8	13.4
Pre-tax gain/loss reclassified from accumulated OCI into earnings	(3.2)	7.8
Cash Flow Hedging \| Forward-starting interest rate swaps \| Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss reclassified from accumulated OCI into earnings		0.0
Cash Flow Hedging \| Forward-starting interest rate swaps \| Interest expense and financing costs
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss reclassified from accumulated OCI into earnings	0.3	0.3
Cash Flow Hedging \| Forward-starting interest rate swaps \| Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss reclassified from accumulated OCI into earnings		0.0
Cash Flow Hedging \| Forward-starting interest rate swaps \| Other comprehensive loss, net of tax
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain/loss reclassified from accumulated OCI into earnings	$ (0.3)	$ (0.3)

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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