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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	6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Mar. 31, 2014 Interest and Penalties [Member]	Jun. 30, 2014 Interest and Penalties [Member]	Mar. 31, 2014 Unrecognized Tax Benefits [Member]	Jun. 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)
Closing balance at June 30, 2014	9.0			0.7		8.3
Current	0	6.8		0		0
Non-current	$ 9.0	$ 6.2		$ 0.7		$ 8.3

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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

-SubTopic 10

-Section S99

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

+ References

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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