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Debt - 2024 Notes Purchase Agreement (Details) SFr in Millions, $ in Millions					12 Months Ended
	Feb. 01, 2024 USD ($)	Jan. 18, 2024 USD ($)	Jul. 12, 2021	Dec. 11, 2019 USD ($)	Dec. 31, 2023 USD ($)	Feb. 01, 2024 CHF (SFr)	Jan. 12, 2024 CHF (SFr)
Debt
Maximum borrowing capacity					$ 753.6
Debt Instrument Prepayment Percentage Of Aggregate Principal Amount			10.00%		10.00%
Minimum interest coverage ratio required					3.5
Subsequent Event
Debt
Debt Instrument Prepayment Percentage Of Aggregate Principal Amount	10.00%
Amended and Restated Credit Agreement \| Subsequent Event \| Adjusted SOFR
Debt
Interest rate added to base rate (as a percent)		1.00%
Amended and Restated Credit Agreement \| Subsequent Event \| Federal Funds
Debt
Interest rate added to base rate (as a percent)		0.50%
Amended and Restated Credit Agreement \| Subsequent Event \| Uncommitted Incremental Facility
Debt
Maximum borrowing capacity		$ 400.0
Amended and Restated Credit Agreement \| Maximum \| Subsequent Event
Debt
Debt instrument issued principal		$ 900.0
Amended and Restated Credit Agreement \| Maximum \| Subsequent Event \| SOFR
Debt
Interest rate added to base rate (as a percent)		1.50%
Amended and Restated Credit Agreement \| Maximum \| Subsequent Event \| Adjusted SOFR
Debt
Interest rate added to base rate (as a percent)		0.50%
Amended and Restated Credit Agreement \| Minimum \| Subsequent Event
Debt
Debt instrument issued principal		$ 600.0
Amended and Restated Credit Agreement \| Minimum \| Subsequent Event \| SOFR
Debt
Interest rate added to base rate (as a percent)		1.00%
Amended and Restated Credit Agreement \| Minimum \| Subsequent Event \| Adjusted SOFR
Debt
Interest rate added to base rate (as a percent)		0.00%
2024 Notes Purchase Agreement \| Subsequent Event
Debt
Senior notes	$ 513.0					SFr 431.0
Debt Instrument, Frequency of Periodic Payment	semi-annually on April 15 and October 15 of each year
Debt Instrument Interest Rate Terms Description	April 15 or October 15, 2024
2019 Credit Agreement
Debt
Incremental facility				$ 250.0
Maximum borrowing capacity				$ 600.0			SFr 230.0
2019 Credit Agreement \| Federal Funds
Debt
Variable interest rate base					federal funds effective rate
2019 Credit Agreement \| Maximum
Debt
Facility fee (as a percent)					0.20%
2019 Credit Agreement \| Maximum \| Subsequent Event
Debt
Facility fee (as a percent)		0.20%
2019 Credit Agreement \| Minimum
Debt
Facility fee (as a percent)					0.10%
2019 Credit Agreement \| Minimum \| Subsequent Event
Debt
Facility fee (as a percent)		0.10%
Note Purchase Agreement \| Subsequent Event
Debt
Interest rate added to base rate (as a percent)	0.50%
Prepayment price as percentage of principal amount, in the event of a change in control	$ 100.0
Maximum leverage ratio allowed	3.5
Minimum interest coverage ratio required	2.5
Period for interest coverage ratio	4 days
Priority debt as a percentage of consolidated net worth	15.00%
2.56% Series 2024A Senior Notes, due April 15, 2034 \| Subsequent Event
Debt
Senior notes \| SFr						SFr 50.0
Interest rate, stated percentage	2.56%					2.56%
2.62% Series 2024B Senior Notes, due April 15, 2036 \| Subsequent Event
Debt
Senior notes \| SFr						SFr 146.0
Interest rate, stated percentage	2.62%					2.62%
2.71% Series 2024C Senior Notes, due April 15, 2039 \| Subsequent Event
Debt
Senior notes \| SFr						SFr 135.0
Interest rate, stated percentage	2.71%					2.71%
2.60% Series 2024A Senior Notes, due April 15, 2036 \| Subsequent Event
Debt
Senior notes \| SFr						SFr 50.0
Interest rate, stated percentage	2.60%					2.60%
2.62% Series 2024B Senior Notes, due April 15, 2039 \| Subsequent Event
Debt
Senior notes \| SFr						SFr 50.0
Interest rate, stated percentage	2.62%					2.62%