Derivatives and Hedging Activities - Fair Value of Derivative Instruments (Details) € in Millions, $ in Millions	Mar. 31, 2020 EUR (€)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Derivatives not designated as hedging instruments:
Total Derivative Assets		$ 12.0	$ 2.8
Total Derivative Liabilities		(10.0)	(4.0)
Net Derivatives		2.0	(1.2)
Long-term debt, less current portion		3,687.2	3,698.6
Foreign currency forward and option contracts
Derivatives not designated as hedging instruments:
Total Derivative Assets		12.0	2.8
Total Derivative Liabilities		(10.0)	(4.0)
Designated as hedging instruments | Foreign currency forward and option contracts
Derivatives not designated as hedging instruments:
Long-term debt, less current portion	€ 400.0	439.7	445.6
Designated as hedging instruments | Cash Flow Hedge
Derivatives not designated as hedging instruments:
Total Derivative Assets		4.9	0.2
Total Derivative Liabilities		(0.1)	(2.0)
Net Derivatives		4.8	(1.8)
Designated as hedging instruments | Cash Flow Hedge | Foreign currency forward and option contracts
Derivatives not designated as hedging instruments:
Total Derivative Assets		4.9	0.2
Total Derivative Liabilities		(0.1)	(2.0)
Non-Designated as Hedging Instruments
Derivatives not designated as hedging instruments:
Total Derivative Assets		7.1	2.6
Total Derivative Liabilities		(9.9)	(2.0)
Net Derivatives		(2.8)	0.6
Non-Designated as Hedging Instruments | Foreign currency forward and option contracts
Derivatives not designated as hedging instruments:
Total Derivative Assets		7.1	2.6
Total Derivative Liabilities		$ (9.9)	$ (2.0)