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Indebtedness (Components of Indebtedness) (Details) € in Millions, $ in Millions	Sep. 30, 2026 USD ($)	Sep. 30, 2026 EUR (€)	Dec. 31, 2025 USD ($)
Debt Instrument [Line Items]
Debt issuance costs	$ (7.7)		$ (9.7)
Total long-term debt	2,599.9		2,384.7
Total long-term indebtedness	2,140.7		2,323.1
Multi-Currency Finance Contract \| EIB Senior term loan due 2029
Debt Instrument [Line Items]
Long-term debt, gross	283.9		293.3
Multi-Currency Finance Contract \| EIB Senior term loan due 2030
Debt Instrument [Line Items]
Long-term debt, gross	193.1		199.4
Line of Credit \| Revolving Credit Facility \| Credit Facility, expires 2027
Debt Instrument [Line Items]
Long-term debt, gross	$ 254.4		0.0
Senior Notes \| 5.450% Senior notes due 2027
Debt Instrument [Line Items]
Interest rate percentage	5.45%	5.45%
Long-term debt, gross	$ 400.0		400.0
Senior term loans due 2026	$ (399.5)		0.0
Senior Notes \| 5.800% Senior notes due 2034
Debt Instrument [Line Items]
Interest rate percentage	5.80%	5.80%
Long-term debt, gross	$ 700.0		700.0
Senior Notes \| 0.800% Senior notes due 2028
Debt Instrument [Line Items]
Interest rate percentage	0.80%	0.80%
Long-term debt, gross	$ 681.4	€ 600.0	703.8
Senior Notes \| Senior term loans due between 2026 and 2028
Debt Instrument [Line Items]
Long-term debt, gross	94.8		97.9
Senior Notes \| Senior term loans due 2026
Debt Instrument [Line Items]
Senior term loans due 2026	$ (59.7)		$ (61.6)