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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.

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