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Stock-Based Compensation Plans - Fair Value of Liability Cash-Settled Long-Term Incentives (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Balance at January 1	$ 0.1	$ 0.0
Compensation charge for the period	0.9	0.1
Balance at December 31	$ 1.0	$ 0.1

X

- Definition

Change in fair value of liability cash-settled stock appreciation rights.

+ References

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- Definition

Fair value of liability cash-settled stock appreciation rights.

+ References

No definition available.

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- References

No definition available.

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