Debt - Components (Parenthetical) (Details) $ / shares in Units, € in Millions, SFr in Millions, $ in Millions				12 Months Ended
		Jan. 01, 2025 USD ($)	Jan. 01, 2025 CHF (SFr)	Dec. 31, 2024 USD ($) $ / shares	Dec. 31, 2024 CHF (SFr)	Dec. 31, 2024 EUR (€)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 CHF (SFr)	Dec. 31, 2022 USD ($)	Jan. 01, 2025 CHF (SFr)	Dec. 11, 2019 USD ($)
Debt Instrument [Line Items]
2025				$ 29.2
2026				266.3
2027				163.5
2028				17.8
2029				498.5
Thereafter				1,104.6
Long-term fixed interest rate debt				1,278.9			$ 883.3
Maximum borrowing capacity				1,059.3
Repayment of long-term debt				$ 135.4			$ 23.5		$ 111.0
2024 Amended and Restated Credit Agreement | Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 109.9								SFr 100
Repayment of long-term debt		$ 137.9	SFr 125
2019 Term Loan Agreement With Ballon Payment Due 2026
Debt Instrument [Line Items]
Maximum borrowing capacity											$ 300.0
2019 Term Loan Agreement With Ballon Payment Due December 2026
Debt Instrument [Line Items]
Annual payment per share amount | $ / shares				$ 15
Note Purchase Agreements Under 2024 Notes Due April 15, 2034
Debt Instrument [Line Items]
Note purchase agreements, amount | SFr	[1]				SFr 50
Debt Instrument, Interest Rate During Period	[1]			2.56%	2.56%	2.56%
Note Purchase Agreements Under 2024 Notes Due April 15, 2036
Debt Instrument [Line Items]
Note purchase agreements, amount | SFr	[1]				SFr 146			SFr 50
Debt Instrument, Interest Rate During Period	[1]			2.62%	2.62%	2.62%	2.60%	2.60%
Note Purchase Agreements Under 2024 Notes Due April 15, 2039
Debt Instrument [Line Items]
Note purchase agreements, amount | SFr	[1]				SFr 135			SFr 50
Debt Instrument, Interest Rate During Period	[1]			2.71%	2.71%	2.71%	2.62%	2.62%
Note Purchase Agreements Under 2021 Notes Due December 8, 2031
Debt Instrument [Line Items]
Note purchase agreements, amount | SFr	[1]				SFr 300
Debt Instrument, Interest Rate During Period	[1]			0.88%	0.88%	0.88%
Note Purchase Agreements Under 2019 Notes Due December 11, 2029
Debt Instrument [Line Items]
Note purchase agreements, amount | SFr	[1]				SFr 297
Debt Instrument, Interest Rate During Period	[1]			1.01%	1.01%	1.01%
Note Purchase Agreements Under 2021 Notes Due December 8, 2031
Debt Instrument [Line Items]
Note purchase agreements, amount | €	[1]					€ 150
Debt Instrument, Interest Rate During Period	[1]			1.03%	1.03%	1.03%
Note Purchase Agreements Under 2012 Notes Due January 18, 2024
Debt Instrument [Line Items]
Note purchase agreements, amount	[1]			$ 300.0
Debt Instrument, Interest Rate During Period	[1]			4.46%	4.46%	4.46%

[1] As of December 31, 2024 and 2023, the fair value of the Company's long-term fixed interest rate debt was $1,278.9 million and $883.3 million as of December 31, 2024, and December 31, 2023, respectively.