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Debt - Summary of Long-Term Debt and Related Weighted Average Interest Rates (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Aug. 31, 2017
Debt Instrument [Line Items]
Long-term debt and other, gross	$ 1,967.7	$ 1,976.4
Debt issuance costs	(13.8)	(15.9)
Long-term debt, net	1,967.2	1,973.4
Long-term debt and other, net	1,953.9	1,960.5
Less — Current portion	(12.9)	(9.0)
Long-term debt	1,941.0	1,951.5
Other
Debt Instrument [Line Items]
Other, gross	5.1	8.1
Other, net	$ 5.1	$ 8.1
Credit Agreement — Term Loan Facility | Term Loan Facility
Debt Instrument [Line Items]
Stated interest rate	3.92%	3.00%
Long-term debt, gross	$ 242.2	$ 248.4
Debt issuance costs	(1.5)	(1.8)
Long-term debt, net	$ 240.7	$ 246.6
5.375% Senior Notes due 2024 (the 2024 Notes) | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	5.375%	5.375%
Long-term debt, gross	$ 325.0	$ 325.0
Debt issuance costs	(2.0)	(2.4)
Long-term debt, net	$ 323.0	$ 322.6
5.25% Senior Notes due 2025 (the 2025 Notes) | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	5.25%	5.25%
Long-term debt, gross	$ 650.0	$ 650.0
Debt issuance costs	(5.0)	(5.8)
Long-term debt, net	$ 645.0	644.2
3.8% Senior Notes due 2027 (the 2027 Notes) | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	3.80%		3.80%
Long-term debt, net of unamortized discount before debt issuance costs	$ 745.4	744.9
Debt issuance costs	(5.3)	(5.9)
Long-term debt, net	$ 740.1	$ 739.0
Weighted Average Interest Rate	3.885%	3.885%	3.885%
Unamortized discount	$ 4.6	$ 5.1

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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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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. 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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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount, after accumulated amortization, of debt discount.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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