Fair Value of Financial Instruments - Financial Assets and Liabilities Carried at Fair Value (Details) - USD ($) $ in Millions		Oct. 31, 2020	Jan. 31, 2020		Oct. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets, fair value		$ 58.6	$ 82.7		$ 93.1
Total financial liabilities, fair value		11.1	5.5		9.6
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets, fair value		38.8	62.0		78.3
Total financial liabilities, fair value		0.0	0.0		0.0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets, fair value		19.8	20.7		14.8
Total financial liabilities, fair value		11.1	5.5		9.6
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets, fair value		0.0	0.0		0.0
Total financial liabilities, fair value		0.0	0.0		0.0
Precious metal forward contracts | Accounts payable and accrued liabilities | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	2.6	0.2		1.0
Precious metal forward contracts | Accounts payable and accrued liabilities | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	1.4
Precious metal forward contracts | Level 1 | Accounts payable and accrued liabilities | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	0.0	0.0		0.0
Precious metal forward contracts | Level 1 | Accounts payable and accrued liabilities | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	0.0
Precious metal forward contracts | Level 2 | Accounts payable and accrued liabilities | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	2.6	0.2		1.0
Precious metal forward contracts | Level 2 | Accounts payable and accrued liabilities | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	1.4
Precious metal forward contracts | Level 3 | Accounts payable and accrued liabilities | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	0.0	0.0		0.0
Precious metal forward contracts | Level 3 | Accounts payable and accrued liabilities | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	0.0
Foreign exchange forward contracts | Accounts payable and accrued liabilities | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	3.7	0.5		0.6
Foreign exchange forward contracts | Accounts payable and accrued liabilities | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	3.2	2.9		3.8
Foreign exchange forward contracts | Level 1 | Accounts payable and accrued liabilities | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	0.0	0.0		0.0
Foreign exchange forward contracts | Level 1 | Accounts payable and accrued liabilities | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	0.0	0.0		0.0
Foreign exchange forward contracts | Level 2 | Accounts payable and accrued liabilities | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	3.7	0.5		0.6
Foreign exchange forward contracts | Level 2 | Accounts payable and accrued liabilities | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	3.2	2.9		3.8
Foreign exchange forward contracts | Level 3 | Accounts payable and accrued liabilities | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	0.0	0.0		0.0
Foreign exchange forward contracts | Level 3 | Accounts payable and accrued liabilities | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	0.0	0.0		0.0
Cross-currency swaps | Accounts payable and accrued liabilities | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	0.2	1.9		4.2
Cross-currency swaps | Level 1 | Accounts payable and accrued liabilities | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	0.0	0.0		0.0
Cross-currency swaps | Level 2 | Accounts payable and accrued liabilities | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	0.2	1.9		4.2
Cross-currency swaps | Level 3 | Accounts payable and accrued liabilities | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, fair value	[1]	0.0	0.0		0.0
Time deposits | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets, fair value	[2]		22.7		40.0
Time deposits | Level 1 | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets, fair value	[2]		22.7		40.0
Time deposits | Level 2 | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets, fair value	[2]		0.0		0.0
Time deposits | Level 3 | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets, fair value	[2]		0.0		0.0
Marketable securities | Other assets, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets, fair value	[3]	38.8	39.3		38.3
Marketable securities | Level 1 | Other assets, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets, fair value	[3]	38.8	39.3		38.3
Marketable securities | Level 2 | Other assets, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets, fair value	[3]	0.0	0.0		0.0
Marketable securities | Level 3 | Other assets, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets, fair value	[3]	0.0	0.0		0.0
Precious metal forward contracts | Prepaid expenses and other current assets | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	14.5	13.0		9.6
Precious metal forward contracts | Prepaid expenses and other current assets | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	0.0
Precious metal forward contracts | Level 1 | Prepaid expenses and other current assets | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	0.0	0.0		0.0
Precious metal forward contracts | Level 1 | Prepaid expenses and other current assets | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	0.0
Precious metal forward contracts | Level 2 | Prepaid expenses and other current assets | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	14.5	13.0		9.6
Precious metal forward contracts | Level 2 | Prepaid expenses and other current assets | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	0.0
Precious metal forward contracts | Level 3 | Prepaid expenses and other current assets | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	0.0	0.0		0.0
Precious metal forward contracts | Level 3 | Prepaid expenses and other current assets | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	0.0
Foreign exchange forward contracts | Prepaid expenses and other current assets | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	0.2	2.7		2.4
Foreign exchange forward contracts | Prepaid expenses and other current assets | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	1.5	2.1		1.5
Foreign exchange forward contracts | Level 1 | Prepaid expenses and other current assets | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	0.0	0.0		0.0
Foreign exchange forward contracts | Level 1 | Prepaid expenses and other current assets | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	0.0	0.0		0.0
Foreign exchange forward contracts | Level 2 | Prepaid expenses and other current assets | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	0.2	2.7		2.4
Foreign exchange forward contracts | Level 2 | Prepaid expenses and other current assets | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	1.5	2.1		1.5
Foreign exchange forward contracts | Level 3 | Prepaid expenses and other current assets | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	0.0	0.0		0.0
Foreign exchange forward contracts | Level 3 | Prepaid expenses and other current assets | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	0.0	0.0		0.0
Cross-currency swaps | Prepaid expenses and other current assets | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	3.6
Cross-currency swaps | Accounts payable and accrued liabilities | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value			2.9	[4]	1.3
Cross-currency swaps | Level 1 | Prepaid expenses and other current assets | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	0.0
Cross-currency swaps | Level 1 | Accounts payable and accrued liabilities | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value			0.0	[4]	0.0
Cross-currency swaps | Level 2 | Prepaid expenses and other current assets | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	3.6
Cross-currency swaps | Level 2 | Accounts payable and accrued liabilities | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value			2.9	[4]	1.3
Cross-currency swaps | Level 3 | Prepaid expenses and other current assets | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value	[4]	$ 0.0
Cross-currency swaps | Level 3 | Accounts payable and accrued liabilities | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value			$ 0.0	[4]	$ 0.0

[1] Included within Accounts payable and accrued liabilities or Other long-term liabilities based on the maturity of the contract.

[2] Included within Short-term investments.

[3] Included within Other assets, net.

[4] Included within Prepaid expenses and other current assets or Other assets, net based on the maturity of the contract.