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Indebtedness (Components of Indebtedness) (Details) € in Millions, $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 USD ($)	Oct. 06, 2021	Jan. 25, 2019 EUR (€)
Debt Instrument [Line Items]
Debt issuance costs	$ (3.1)		$ (3.6)
Total long-term debt	1,379.5		1,451.9
Total long-term indebtedness	1,377.2		1,264.8
Line of Credit \| Credit facility, expires 2027 \| Revolving credit facility
Debt Instrument [Line Items]
Long-term debt, gross	0.0		200.0
Line of Credit \| EIB Senior Term Loan due 2029
Debt Instrument [Line Items]
Long-term debt, gross	276.7		0.0
Senior Notes \| 1.002% EIB Senior term loan due 2025
Debt Instrument [Line Items]
Debt instrument, interest rate, percent					1.002%
Long-term debt, gross	276.7		267.3		€ 250.0
Senior Notes \| Senior term loans due between 2023 and 2028
Debt Instrument [Line Items]
Long-term debt, gross	162.1	€ 146.5	341.6
Senior Notes \| 0.800% Senior Notes Due 2028
Debt Instrument [Line Items]
Debt instrument, interest rate, percent				0.80%
Long-term debt, gross	664.0	€ 600.0	641.5
Senior Notes \| Senior term loans due 2023
Debt Instrument [Line Items]
Less: Senior term loans due 2023, net of debt issuance costs	0.0		(184.9)
Other Long-term debt
Debt Instrument [Line Items]
Long-term debt, gross	3.1		5.1
Less: Senior term loans due 2023, net of debt issuance costs	$ (2.3)		$ (2.2)