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.