Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Income tax provision	$ 47.1us-gaap_IncomeTaxExpenseBenefit	$ 50.0us-gaap_IncomeTaxExpenseBenefit
Effective income tax rate, percent	34.20%	35.70%
Effective income tax rate, at federal statutory income tax rate, percent	35.00%	35.00%
Cash paid for taxes, net of refunds received	$ 9.8us-gaap_IncomeTaxesPaidNet	$ 1.7us-gaap_IncomeTaxesPaidNet

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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-Section S99

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

+ References

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

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Glossary Income Tax Expense (or Benefit)

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