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U.K. Sale - Additional Information (Detail) - USD ($) $ in Millions			12 Months Ended
	Jan. 19, 2021	Jan. 05, 2021	Dec. 31, 2020	Dec. 31, 2019
Tranche B-4 Facilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Repayments of debt	$ 767.9	$ 105.0
Discontinued Operations [Member] | U.K. Sales [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale			$ 867.3
Goodwill impairment loss			356.2
Cash paid for capital expenditures			$ 48.4	$ 59.6
Discontinued Operations [Member] | U.K. Sales [Member] | Subsequent Event [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross proceeds from sale of business	1,525.0
Cash retained by buyer	75.0
Transaction costs	16.0
Settlement of existing foreign currency hedging liabilities	85.0
Net proceeds from sale of business	1,425.0
Net proceeds from sale of business, after deducting cash retained by buyer	1,350.0
Cash	345.0
Discontinued Operations [Member] | Tranche B-4 Facilities [Member] | U.K. Sales [Member] | Subsequent Event [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Repayments of debt	768.0
Term Loan A- Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Repayments of debt	311.7
Term Loan A- Facility [Member] | Discontinued Operations [Member] | U.K. Sales [Member] | Subsequent Event [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Repayments of debt	$ 312.0

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