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Indebtedness (Components of Indebtedness) (Details) € in Millions, $ in Millions	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2014
Debt Instrument [Line Items]
Other long-term debt	$ 12.7		$ 20.6
Debt issuance costs	(2.3)		(2.6)
Long-term Debt	1,550.8		1,347.9
Current portion of long term debt	(63.6)		(72.6)
Total long-term indebtedness, less current portion	1,269.2		1,275.3
1.056% Senior term loan due 2020
Debt Instrument [Line Items]
Senior notes	218.0		228.7
Current portion of long term debt	$ (218.0)		0.0
Debt instrument, interest rate, percent	1.056%	1.056%		1.056%
Senior term loan due 2022
Debt Instrument [Line Items]
Senior notes	$ 163.5		171.5
Credit facility, expires 2023
Debt Instrument [Line Items]
Credit facility	109.0		114.4
1.002% Senior term loan due 2025
Debt Instrument [Line Items]
Senior notes	$ 272.6		$ 0.0
Debt instrument, interest rate, percent	1.002%	1.002%	1.002%
Senior term loans due between 2019 and 2028
Debt Instrument [Line Items]
Senior notes	$ 777.3		$ 815.3
Current portion of long term debt	(61.1)	€ (56.0)	(63.8)
Current portion of other long-term debt
Debt Instrument [Line Items]
Current portion of long term debt	$ (2.5)		$ (8.8)