Fair Value Measurements and Risk - Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Asset Derivatives
Total derivatives	$ 0.0	$ 9.5
Liability Derivatives
Total derivatives	32.9	4.3
Currency contracts | Derivatives designated as hedging instruments under ASC 815: | Other current assets
Asset Derivatives
Total derivatives	0.0	2.1
Liability Derivatives
Total derivatives	(1.4)	(3.1)
Currency contracts | Derivatives designated as hedging instruments under ASC 815: | Other assets
Asset Derivatives
Total derivatives	0.0	4.0
Currency contracts | Derivatives designated as hedging instruments under ASC 815: | Other liabilities
Liability Derivatives
Total derivatives	7.3	4.0
Currency contracts | Derivatives not designated as hedging instruments under ASC 815: | Other current assets
Asset Derivatives
Total derivatives	0.0	0.0
Liability Derivatives
Total derivatives		(0.2)
Currency contracts | Derivatives not designated as hedging instruments under ASC 815: | Other current liabilities
Liability Derivatives
Total derivatives	1.1	0.2
Interest rate contracts | Derivatives designated as hedging instruments under ASC 815: | Other current assets
Asset Derivatives
Total derivatives	0.0	0.0
Interest rate contracts | Derivatives designated as hedging instruments under ASC 815: | Other assets
Asset Derivatives
Total derivatives	0.0	0.0
Interest rate contracts | Derivatives designated as hedging instruments under ASC 815: | Other current liabilities
Liability Derivatives
Total derivatives	2.5	1.0
Interest rate contracts | Derivatives designated as hedging instruments under ASC 815: | Other liabilities
Liability Derivatives
Total derivatives	3.5	2.4
Variable-to-fixed cross-currency swaps | Derivatives designated as hedging instruments under ASC 815: | Other current assets
Asset Derivatives
Total derivatives	0.0	10.2
Liability Derivatives
Total derivatives	(0.8)
Variable-to-fixed cross-currency swaps | Derivatives designated as hedging instruments under ASC 815: | Other assets
Asset Derivatives
Total derivatives	0.0
Variable-to-fixed cross-currency swaps | Derivatives designated as hedging instruments under ASC 815: | Other current liabilities
Liability Derivatives
Total derivatives		0.0
Variable-to-fixed cross-currency swaps | Derivatives designated as hedging instruments under ASC 815: | Other liabilities
Asset Derivatives
Total derivatives		(6.8)
Liability Derivatives
Total derivatives	$ 20.7	$ 0.0