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Pension Plans - Summary of Amounts in Accumulated OCI to be Amortized Over Next Fiscal Year (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Compensation and Retirement Disclosure [Abstract]
Amortization of unrecognized loss	$ 27.6
Amortization of prior service credit	(1.1)
Total to be recognized in net periodic benefit cost	$ 26.5

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- Definition

Defined Benefit Plan Future Amortization Of Unrecognized Gain Loss

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No definition available.

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- References

No definition available.

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- Definition

Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

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No definition available.

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- Definition

Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

+ References

No definition available.

+ Details

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