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Debt - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Apr. 30, 2018	Dec. 31, 2017	Nov. 14, 2014
Debt Instrument [Line Items]
Loss on debt extinguishment	$ (7.1)		$ (25.7)
Capitalization of financing costs	3.6		3.6
Fair value of our indebtedness	678.3		678.3		$ 1,154.1
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Available capacity for letters of credit	300.0		$ 300.0		$ 130.0	$ 130.0
Line of credit maturity period			2019-09
2018 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Available capacity for letters of credit				$ 300.0
Line of credit maturity period			2023-04
Term Debt [Member]
Debt Instrument [Line Items]
Debt instrument principal amount						$ 702.0
Term loan debt maturity period			2020-09
Term debt final mandatory principal pre-payments		$ 0.3
Senior Notes [Member]
Debt Instrument [Line Items]
Loss on debt extinguishment	$ (18.6)
2018 Term Debt [Member]
Debt Instrument [Line Items]
Debt instrument principal amount				$ 680.0
Term loan debt maturity period			2025-04
Interest rate description			Interest rate is reduced to LIBOR plus 3.00%

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Debt instrument final mandatory principal repayment.

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Debt instrument maturity month and year.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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