Debt - Components (Details) - USD ($) $ in Millions		Mar. 31, 2025	Dec. 31, 2024
Debt
Unamortized debt issuance costs		$ (2.9)	$ (3.1)
Total notes and loans outstanding		2,095.7	2,076.8
Total debt		2,113.8	2,094.3
Current portion of long-term debt and finance lease obligations		(37.7)	(32.5)
Total long-term debt, less current portion		2,076.1	2,061.8
CHF loan due 2027
Debt
Debt, before unamortized debt issuance costs		165.3	162.1
CHF loan due 2029
Debt
Debt, before unamortized debt issuance costs		165.3	162.1
CHF loan due 2031
Debt
Debt, before unamortized debt issuance costs	[1]	169.5	165.2
2019 Term Loan Agreement With Balloon Payment Due December 2026
Debt
Debt, before unamortized debt issuance costs		259.5	263.3
Note Purchase Agreements Under 2024 Notes Due April 15, 2034
Debt
Debt, before unamortized debt issuance costs	[1]	56.5	55.1
Note Purchase Agreements Under 2024 Notes Due April 15, 2036
Debt
Debt, before unamortized debt issuance costs	[1]	221.5	215.9
Note Purchase Agreements Under 2024 Notes Due April 15, 2039
Debt
Debt, before unamortized debt issuance costs	[1]	209.1	203.8
Note Purchase Agreements Under 2021 Notes Due December 8, 2031
Debt
Debt, before unamortized debt issuance costs	[1]	339.1	330.5
Note Purchase Agreements Under 2019 Notes Due December 11, 2029
Debt
Debt, before unamortized debt issuance costs	[1]	335.7	327.2
Note Purchase Agreements Under 2021 Notes Due December 8, 2031
Debt
Debt, before unamortized debt issuance costs	[1]	162.2	155.3
2024 Revolving Credit Agreement
Debt
Debt, before unamortized debt issuance costs	[2]	0.0	27.5
Other loan
Debt
Debt, before unamortized debt issuance costs		14.9	11.9
Finance lease obligations
Debt
Total debt		$ 18.1	$ 17.5

[1] The fair value of the Company's long-term fixed interest rate debt was $1,288.4 million and $1,278.9 million as of March 31, 2025, and December 31, 2024, respectively.

[2] Subsequent to March 31, 2025, and up until the date of filing this Quarterly Report on Form 10-Q, the Company borrowed $10 million, net through a swing line drawing and CHF $90.0 million (approximately $110.5 million) of debt outstanding under the 2024 Amended and Restated Revolving Credit Agreement.