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Summary of Significant Accounting Policies - Additional Information 2 (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Operations And Summary Of Significant Accounting Policies [Line Items]
Derivative financial instruments, liability	$ 6.0
Derivative financial instruments, asset		$ 1.4
Fixed Rate Debt
Operations And Summary Of Significant Accounting Policies [Line Items]
Long-term debt, including current portion, Carrying Value	1,100.0	1,300.0
Level 2 | Fixed Rate Debt
Operations And Summary Of Significant Accounting Policies [Line Items]
Long-term debt, including current portion, Fair Value	$ 1,100.0	$ 428.8

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Operations and summary of significant accounting policies.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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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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