Derivatives and Hedging Activities - Fair Value of Derivative Instruments (Details) € in Millions, $ in Millions	Sep. 30, 2017 EUR (€)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 USD ($)
Derivatives not designated as hedging instruments:
Total Derivative Assets		$ 3.6		$ 40.2
Total Derivative Liabilities		(14.3)		(16.9)
Net Derivatives		(10.7)		23.3
Long-term debt, less current portion		3,219.4		3,762.6
Reclassified to liabilities held for sale		(1.8)		(683.3)
Reclassified to assets held for sale		20.8		825.7
Foreign currency forward contracts
Derivatives not designated as hedging instruments:
Total Derivative Assets		3.6		16.3
Total Derivative Liabilities		(14.3)		(11.6)
Reclassified to liabilities held for sale				(1.4)
Interest rate and currency swaps
Derivatives not designated as hedging instruments:
Total Derivative Assets		0.0		23.9
Reclassified to assets held for sale				23.9
Cross-currency swaps
Derivatives not designated as hedging instruments:
Total Derivative Liabilities		0.0		(5.3)
Designated as Hedging Instruments | Foreign currency forward contracts
Derivatives not designated as hedging instruments:
Long-term debt, less current portion	€ 400.0	467.9	€ 416.7	416.7
Designated as Hedging Instruments | Cash Flow
Derivatives not designated as hedging instruments:
Total Derivative Assets		0.2		28.8
Total Derivative Liabilities		(3.0)		(0.1)
Net Derivatives		(2.8)		28.7
Designated as Hedging Instruments | Cash Flow | Foreign currency forward contracts
Derivatives not designated as hedging instruments:
Total Derivative Assets		0.2		4.9
Total Derivative Liabilities		(3.0)		(0.1)
Designated as Hedging Instruments | Cash Flow | Interest rate and currency swaps
Derivatives not designated as hedging instruments:
Total Derivative Assets		0.0		23.9
Designated as Hedging Instruments | Cash Flow | Cross-currency swaps
Derivatives not designated as hedging instruments:
Total Derivative Liabilities		0.0		0.0
Designated as Hedging Instruments | Net Investment Hedge
Derivatives not designated as hedging instruments:
Total Derivative Assets		0.0		0.0
Total Derivative Liabilities		0.0		(5.3)
Net Derivatives		0.0		(5.3)
Designated as Hedging Instruments | Net Investment Hedge | Foreign currency forward contracts
Derivatives not designated as hedging instruments:
Total Derivative Assets		0.0		0.0
Total Derivative Liabilities		0.0		0.0
Designated as Hedging Instruments | Net Investment Hedge | Interest rate and currency swaps
Derivatives not designated as hedging instruments:
Total Derivative Assets		0.0		0.0
Designated as Hedging Instruments | Net Investment Hedge | Cross-currency swaps
Derivatives not designated as hedging instruments:
Total Derivative Liabilities		0.0		(5.3)
Non-Designated
Derivatives not designated as hedging instruments:
Total Derivative Assets		3.4		11.4
Total Derivative Liabilities		(11.3)		(11.5)
Net Derivatives		(7.9)		(0.1)
Non-Designated | Foreign currency forward contracts
Derivatives not designated as hedging instruments:
Total Derivative Assets		3.4		11.4
Total Derivative Liabilities		(11.3)		(11.5)
Non-Designated | Interest rate and currency swaps
Derivatives not designated as hedging instruments:
Total Derivative Assets		0.0		0.0
Non-Designated | Cross-currency swaps
Derivatives not designated as hedging instruments:
Total Derivative Liabilities		$ 0.0		$ 0.0