Derivatives and Hedging Activities - Fair Value of Derivative Instruments (Details) € in Millions, $ in Millions	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2018 USD ($)
Derivatives Fair Value [Line Items]
Total Derivative Assets	$ 2.8		$ 3.5
Total Derivative Liabilities	(4.0)		(2.9)
Net Derivatives	(1.2)		0.6
Excludes debt designated as net investment hedge	3,698.6		3,236.5
Foreign Currency Forward Contracts
Derivatives Fair Value [Line Items]
Total Derivative Assets	2.8		3.5
Total Derivative Liabilities	(4.0)		(2.9)
Designated as Hedging Instruments | Foreign Currency Forward Contracts
Derivatives Fair Value [Line Items]
Excludes debt designated as net investment hedge	445.6	€ 400.0	454.9
Non-Designated as Hedging Instruments
Derivatives Fair Value [Line Items]
Total Derivative Assets	2.6		1.7
Total Derivative Liabilities	(2.0)		(2.7)
Net Derivatives	0.6		(1.0)
Non-Designated as Hedging Instruments | Foreign Currency Forward Contracts
Derivatives Fair Value [Line Items]
Total Derivative Assets	2.6		1.7
Total Derivative Liabilities	(2.0)		(2.7)
Cash Flow Hedge | Designated as Hedging Instruments
Derivatives Fair Value [Line Items]
Total Derivative Assets	0.2		1.8
Total Derivative Liabilities	(2.0)		(0.2)
Net Derivatives	(1.8)		1.6
Cash Flow Hedge | Designated as Hedging Instruments | Foreign Currency Forward Contracts
Derivatives Fair Value [Line Items]
Total Derivative Assets	0.2		1.8
Total Derivative Liabilities	$ (2.0)		$ (0.2)