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Employee Benefit Plans - Schedule of Combined Funded Status and Net Periodic Pension Cost and Postretirement Benefit - Postretirement Benefits (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Other Postretirement Benefits Plan [Member]
Accumulated other comprehensive loss, tax	$ (9.9)	$ (9.9)

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- Definition

Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Tax

+ References

No definition available.

+ Details

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- Details

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