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Debt - Summary of Long-Term Debt (Detail) - USD ($) $ in Millions	Sep. 30, 2017		Aug. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,975.0			$ 1,943.7
Long-term debt and other	1,978.4			1,949.4
Debt issuance costs	(16.4)			(15.8)
Long-term debt and other, net	1,962.0			1,933.6
Less — Current portion	(9.0)	[1]		(35.6)
Long-term debt	$ 1,953.0	[1]		$ 1,898.0
Credit agreement | Term Loan Facility | Credit Agreement — Term Loan Facility
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.70%			2.105%
Long-term debt, gross	$ 250.0			$ 468.7
Debt issuance costs	(1.9)			(1.6)
Long-term debt, net	$ 248.1			$ 467.1
Senior notes | 4.75% Senior Notes due 2023 (2023 Notes)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.75%			4.75%
Long-term debt, gross	$ 0.0			$ 500.0
Debt issuance costs	0.0			(4.8)
Long-term debt, net	$ 0.0			$ 495.2
Senior notes | 5.375% Senior Notes due 2024 (2024 Notes)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.375%			5.375%
Long-term debt, gross	$ 325.0			$ 325.0
Debt issuance costs	(2.5)			(2.8)
Long-term debt, net	$ 322.5			$ 322.2
Senior notes | 5.25% Senior Notes due 2025 (2025 Notes)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.25%			5.25%
Long-term debt, gross	$ 650.0			$ 650.0
Debt issuance costs	(6.0)			(6.6)
Long-term debt, net	$ 644.0			643.4
Senior notes | 3.8% Senior Notes due 2027 (2027 Notes) (1)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.80%		3.80%
Long-term debt, net of unamortized discount before debt issuance costs	$ 744.8			0.0
Debt issuance costs	(6.0)			0.0
Long-term debt, net	$ 738.8			0.0
Weighted Average Interest Rate	3.885%		3.885%
Unamortized discount	$ 5.2
Other | Other
Debt Instrument [Line Items]
Other	8.6			5.7
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, before unamortized (discount) premium and debt issuance costs, of long-term debt and capital lease obligations. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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