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Income Taxes - Roll-Forward of Unrecognized Tax Benefits and Associated Accrued Interest and Penalties (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Mar. 31, 2014 Interest and Penalties [Member]	Sep. 30, 2014 Interest and Penalties [Member]	Mar. 31, 2014 Unrecognized Tax Benefits [Member]	Sep. 30, 2014 Unrecognized Tax Benefits [Member]
Income Tax Contingency [Line Items]
Opening balance at January 1, 2014	$ 13.0		$ 1.1	$ 1.1	$ 11.9	$ 11.9
Reductions for tax positions of prior periods	(4.0)		(0.4)	(0.4)	(3.6)	(3.6)
Reductions due to lapsed statute of limitations	(3.1)			(0.2)		(2.9)
Closing balance at September 30, 2014	5.9			0.5		5.4
Current	0	6.8		0		0
Non-current	$ 5.9	$ 6.2		$ 0.5		$ 5.4

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The current portion of the amount recognized for uncertain tax positions as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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The noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854



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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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