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
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits - January 1	$ 161.2us-gaap_UnrecognizedTaxBenefits	$ 208.8us-gaap_UnrecognizedTaxBenefits	$ 198.7us-gaap_UnrecognizedTaxBenefits
Additions for:
Prior year tax positions	2.4	1.6	48.4
Current year tax positions	2.8	8.0	0.8
Assumed in acquisition	0	0	3.8
Reductions for:
Prior year tax positions	(2.8)	(55.4)	(4.8)
Settlements	(1.0)	(1.0)	(33.6)
Lapse of statute	(2.5)	(0.8)	(4.5)
Unrecognized tax benefits - December 31	$ 160.1us-gaap_UnrecognizedTaxBenefits	$ 161.2us-gaap_UnrecognizedTaxBenefits	$ 208.8us-gaap_UnrecognizedTaxBenefits

Reconciliation uncertain tax position purchase accounting.

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

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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 settlements with taxing authorities.

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

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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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