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Debt - Summary of Long-Term Debt (Detail) - USD ($) $ in Millions	Jun. 30, 2018		Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,970.3		$ 1,973.4
Long-term debt and other	1,972.0		1,976.4
Debt issuance costs	(14.8)		(15.9)
Long-term debt and other, net	1,957.2		1,960.5
Less — Current portion	(9.0)	[1]	(9.0)
Long-term debt	1,948.2	[1]	1,951.5
Credit agreement | Term Loan Facility | Credit Agreement — Term Loan Facility
Debt Instrument [Line Items]
Long-term debt, gross	245.3		248.4
Debt issuance costs	(1.6)		(1.8)
Long-term debt, net	$ 243.7		$ 246.6
Debt instrument, interest rate, stated percentage	3.49%		3.00%
Senior notes | 5.375% Senior Notes due 2024 (2024 Notes)
Debt Instrument [Line Items]
Long-term debt, gross	$ 325.0		$ 325.0
Debt issuance costs	(2.2)		(2.4)
Long-term debt, net	$ 322.8		$ 322.6
Debt instrument, interest rate, stated percentage	5.375%		5.375%
Senior notes | 5.25% Senior Notes due 2025 (2025 Notes)
Debt Instrument [Line Items]
Long-term debt, gross	$ 650.0		$ 650.0
Debt issuance costs	(5.4)		(5.8)
Long-term debt, net	$ 644.6		$ 644.2
Debt instrument, interest rate, stated percentage	5.25%		5.25%
Senior notes | 3.8% Senior Notes due 2027 (2027 Notes) (1)
Debt Instrument [Line Items]
Long-term debt, net of unamortized discount before debt issuance costs	$ 745.1		$ 744.9
Debt issuance costs	(5.6)		(5.9)
Long-term debt, net	$ 739.5		$ 739.0
Debt instrument, interest rate, stated percentage	3.80%
Debt instrument, interest rate, effective percentage	3.885%		3.885%
Unamortized discount	$ 4.9		$ 5.1
Other | Other
Debt Instrument [Line Items]
Other	6.6		8.1
Debt issuance costs	$ 0.0		$ 0.0
[1] Unaudited.

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Long-term Debt, Net of Unamortized Discount before Debt Issuance Costs

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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