Debt - Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Carrying Amount [Member] | Senior Secured Credit Facilities [Member]
Financial liabilities:
Credit facility	$ 5,103.0	$ 5,198.7
Carrying Amount [Member] | 5.5% Senior Notes due 2027 [Member]
Financial liabilities:
Senior notes	2,000.0	2,000.0
Carrying Amount [Member] | Senior Secured Credit Facilities, Revolving Portion [Member]
Financial liabilities:
Credit facility	246.0
Carrying Amount [Member] | Other Indebtedness [Member]
Financial liabilities:
Credit facility	24.0	25.6
Fair Value [Member] | Senior Secured Credit Facilities [Member]
Financial liabilities:
Credit facility	4,759.7	5,231.7
Fair Value [Member] | 5.5% Senior Notes due 2027 [Member]
Financial liabilities:
Credit facility	2,062.5	2,135.0
Fair Value [Member] | Senior Secured Credit Facilities, Revolving Portion [Member]
Financial liabilities:
Credit facility	221.7
Fair Value [Member] | Other Indebtedness [Member]
Financial liabilities:
Credit facility	$ 24.2	$ 25.9