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Basis of Presentation and Accounting Policies - Additional Information (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 01, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |
Non-cash impairment charge loss |  | $ 0.0 | $ 0.0 | $ 0.0 | $ 66.8 |
Goodwill |  | $ 1,206.6 |  | $ 1,206.6 |  | $ 1,225.8
NETHERLANDS |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of goodwill over fair value of reporting unit |  |  |  | 5.50% |  |
Ettain Group [Member] | Subsequent Event [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Aggregate cash consideration paid | $ 930.9 |  |  |  |  |
Draw on revolving credit facility | 150.0 |  |  |  |  |
Ettain Group [Member] | working capital and cash [Member] | Subsequent Event [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Aggregate cash consideration paid | 5.9 |  |  |  |  |
Ettain Group [Member] | Acquired interests [Member] | Subsequent Event [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Aggregate cash consideration paid | $ 925.0 |  |  |  |  |
Netherlands | Discount Rates |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of goodwill over fair value of reporting unit |  |  |  | 10.40% |  |
Netherlands | Terminal Value Revenue Growth Rate |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  | 2.0 |  | 2.0 |  |
Netherlands | Terminal Value OUP Margin |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  | 3.5 |  | 3.5 |  |
Northern Europe | United Kingdom |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Goodwill |  | $ 110.3 |  | $ 110.3 |  | 100.2
Northern Europe | Netherlands |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Goodwill |  | $ 114.2 |  | $ 114.2 |  | $ 119.3
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 | Terminal Value Revenue Growth Rate |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  | 3.0 |  | 3.0 |  |
Maximum [Member] | Netherlands | Terminal Value Revenue Growth Rate |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  | 5.0 |  | 5.0 |  |

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