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Income Taxes Uncertain tax positions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Uncertain tax positions	1.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies	(1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 14.6us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	$ 12.8us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Unrecognized Tax Benefits	42.2us-gaap_UnrecognizedTaxBenefits	48.9us-gaap_UnrecognizedTaxBenefits	49.9us-gaap_UnrecognizedTaxBenefits	23.5us-gaap_UnrecognizedTaxBenefits
Tax positions taken in current year	0.1us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0.1us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Tax positions taken in prior years	1.3us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0.4us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	33.9us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Tax positions taken in current year	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions
Tax positions taken in prior years	(8.1)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	(7.4)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Settlements during the year	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	(0.2)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	1.0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	0.2us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 4.7us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	$ 5.7us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

X

- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

+ References

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-Name Accounting Standards Codification

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

+ References

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Amount of decrease 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 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 accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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