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Basis of Presentation and Accounting Policies - Additional Information (Details) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2021
Accounting Policies [Line Items] |  |  |  |
Non-cash impairment charge loss |  | $ 0.0 |  |
Goodwill | [1] | $ 1,669.9 | $ 1,722.2 |
Netherlands |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Percentage of goodwill over fair value of reporting unit |  | 5.50% |  |
Discount rate for goodwill impairment test (as a percent) |  |  |  | 10.4
Netherlands | Terminal Value Revenue Growth Rate |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  |  |  | 2.0
Netherlands | Terminal Value OUP Margin |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  |  |  | 3.5
Northern Europe | United Kingdom |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Goodwill |  | $ 100.8 | 110.7 |
Northern Europe | Netherlands |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Goodwill |  | $ 103.5 | $ 112.2 |
Minimum |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Percentage of goodwill over fair value of reporting unit |  | 20.00% |  |
Minimum | Other Reporting Units |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Percentage of goodwill over fair value of reporting unit |  | 20.00% |  |
Minimum | Netherlands |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  |  |  | 3.0
Maximum [Member] | Netherlands |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  |  |  | 5.0
[1] | Balances were net of accumulated impairment loss of $644.2 as of both June 30, 2022 and December 31, 2021.

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