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Stock-Based Compensation Plans - Summary of Fair Value of Balance Sheet Dates (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Balance at January 1	$ 0.1	$ 0.0
Compensation charge for the period	0.4	0.1
Balance at September 30	$ 0.5	$ 0.1

X

- Definition

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

+ References

No definition available.

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X

- Definition

Fair value of liability cash-settled stock appreciation rights.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
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- References

No definition available.

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