Derivatives and Hedging Activities - Fair Value of Derivative Instruments (Details) € in Millions, $ in Millions	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2019 USD ($)
Derivatives Fair Value [Line Items]
Total Derivative Assets	$ 7.3		$ 2.8
Total Derivative Liabilities	(7.0)		(4.0)
Net Derivatives	0.3		(1.2)
Excludes debt designated as net investment hedge	3,731.4		3,698.6
Foreign Currency Forward Contracts
Derivatives Fair Value [Line Items]
Total Derivative Assets	7.3		2.8
Total Derivative Liabilities	(7.0)		(4.0)
Designated as Hedging Instruments | Foreign Currency Forward Contracts
Derivatives Fair Value [Line Items]
Excludes debt designated as net investment hedge	490.2	€ 400.0	445.6
Non-Designated as Hedging Instruments
Derivatives Fair Value [Line Items]
Total Derivative Assets	7.3		2.6
Total Derivative Liabilities	(4.2)		(2.0)
Net Derivatives	3.1		0.6
Non-Designated as Hedging Instruments | Foreign Currency Forward Contracts
Derivatives Fair Value [Line Items]
Total Derivative Assets	7.3		2.6
Total Derivative Liabilities	(4.2)		(2.0)
Cash Flow Hedge | Designated as Hedging Instruments
Derivatives Fair Value [Line Items]
Total Derivative Assets	0.0		0.2
Total Derivative Liabilities	(2.8)		(2.0)
Net Derivatives	(2.8)		(1.8)
Cash Flow Hedge | Designated as Hedging Instruments | Foreign Currency Forward Contracts
Derivatives Fair Value [Line Items]
Total Derivative Assets	0.0		0.2
Total Derivative Liabilities	$ (2.8)		$ (2.0)