Basis of Presentation and Accounting Policies - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2025		Jun. 30, 2024	Jun. 30, 2025		Jun. 30, 2024	Dec. 31, 2024
Accounting Policies [Line Items]
Impairment charges		$ 88.7	[1]	$ 0.0	$ 88.7	[2]	$ 0.0
Goodwill	[3]	$ 1,549.0			$ 1,549.0			$ 1,563.4
Switzerland
Accounting Policies [Line Items]
Discount rate		11.20%			11.20%
Revenue percentage		10.50%			10.50%
United Kingdom
Accounting Policies [Line Items]
Discount rate		11.40%			11.40%
Revenue percentage		6.60%			6.60%
Terminal Value Revenue Growth Rate | Switzerland
Accounting Policies [Line Items]
Revenue Growth Percentage		3.00%			3.00%
Terminal Value Revenue Growth Rate | United Kingdom
Accounting Policies [Line Items]
Revenue Growth Percentage		3.00%			3.00%
Terminal Value OUP Margin | Switzerland
Accounting Policies [Line Items]
Revenue Growth Percentage		4.20%			4.20%
Terminal Value OUP Margin | United Kingdom
Accounting Policies [Line Items]
Revenue Growth Percentage		3.20%			3.20%
Maximum [Member] | Switzerland
Accounting Policies [Line Items]
Revenue Growth Percentage		12.40%			12.40%
Maximum [Member] | United Kingdom
Accounting Policies [Line Items]
Revenue Growth Percentage		10.00%			10.00%
Maximum [Member] | Terminal Value OUP Margin | Switzerland
Accounting Policies [Line Items]
Revenue Growth Percentage		4.00%			4.00%
Minimum [Member] | Switzerland
Accounting Policies [Line Items]
Revenue Growth Percentage		12.00%			12.00%
Minimum [Member] | United Kingdom
Accounting Policies [Line Items]
Revenue Growth Percentage		8.40%			8.40%
Minimum [Member] | Terminal Value Revenue Growth Rate | Switzerland
Accounting Policies [Line Items]
Revenue Growth Percentage		1.00%			1.00%
Northern Europe | United Kingdom
Accounting Policies [Line Items]
Impairment charges					$ 33.4
Goodwill		$ 79.3			79.3
Southern Europe | Switzerland
Accounting Policies [Line Items]
Impairment charges					24.7
Impairment					30.6
Goodwill		$ 35.8			$ 35.8
Discount rate		13.70%			13.70%

[1] Impairment charges for the three months ended June 30, 2025 consist of a goodwill impairment related to our investments in Switzerland and the United Kingdom and an impairment of an indefinite lived intangible asset in our Switzerland business.

[2] Impairment charges for the six months ended June 30, 2025 consist of a goodwill impairment related to our investments in Switzerland and the United Kingdom and an impairment of an indefinite lived intangible asset in our Switzerland business.

[3] Balances were net of accumulated impairment loss of $807.4 and $749.3 as of June 30, 2025 and December 31, 2024, respectively.