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Basis of Presentation and Accounting Policies - Additional Information (Details) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Accounting Policies [Line Items]
Non-cash impairment charge loss		$ 0.0	$ 66.8		$ 66.8
Goodwill	$ 1,219.1			$ 1,219.1		$ 1,225.8
United Kingdom
Accounting Policies [Line Items]
Percentage of goodwill over fair value of reporting unit				12.00%
United Kingdom | Discount Rates
Accounting Policies [Line Items]
Discount rate for goodwill impairment test (as a percent)	11.5			11.5
United Kingdom | Terminal Value Revenue Growth Rate
Accounting Policies [Line Items]
Discount rate for goodwill impairment test (as a percent)	1.0			1.0
United Kingdom | Terminal Value OUP Margin
Accounting Policies [Line Items]
Discount rate for goodwill impairment test (as a percent)	3.1			3.1
Netherlands
Accounting Policies [Line Items]
Percentage of goodwill over fair value of reporting unit				3.30%
Netherlands | Discount Rates
Accounting Policies [Line Items]
Percentage of goodwill over fair value of reporting unit				10.90%
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
Accounting Policies [Line Items]
Goodwill	$ 115.8			$ 115.8
Northern Europe | United Kingdom
Accounting Policies [Line Items]
Goodwill	101.3			101.3		100.2
Northern Europe | Netherlands
Accounting Policies [Line Items]
Goodwill	$ 115.8			$ 115.8		$ 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%

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