Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Unrecognized Tax Benefits [Line Items]
Unrecognized tax benefits - beginning of year	$ 23.7us-gaap_UnrecognizedTaxBenefits	$ 20.8us-gaap_UnrecognizedTaxBenefits	$ 35.4us-gaap_UnrecognizedTaxBenefits
Gross additions - current year tax positions	8.7	4.4	2.8
Gross additions - prior year tax positions	2.2	0.7	0.6
Gross (reductions)/additions - purchase accounting adjustments	(1.1)	1.6
Gross reductions - prior year tax positions	(2.5)	(3.2)	(13.5)
Gross reductions - settlements with taxing authorities		(0.6)	(4.0)
Impact due to expiration of statutes of limitations			(0.5)
Unrecognized tax benefits - end of year	$ 31.0us-gaap_UnrecognizedTaxBenefits	$ 23.7us-gaap_UnrecognizedTaxBenefits	$ 20.8us-gaap_UnrecognizedTaxBenefits

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Unrecognized Tax Benefits Increases Resulting From Purchase Accounting

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- Definition

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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-Publisher FASB

-Name Accounting Standards Codification

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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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

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Amount of increase 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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