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Income Taxes (Contingencies) (Details) (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]
Balance at January 1	$ 4.8us-gaap_UnrecognizedTaxBenefits	$ 6.8us-gaap_UnrecognizedTaxBenefits	$ 6.4us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to the current year	0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Additions for tax positions of prior years	0.9us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0.8us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0.5us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Reductions for tax positions of prior years	(0.1)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	(0.2)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Reductions for expirations of statute of limitations	(0.4)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	(2.2)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Settlements	(0.3)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	(0.4)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	(0.1)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Balance at December 31	4.9us-gaap_UnrecognizedTaxBenefits	4.8us-gaap_UnrecognizedTaxBenefits	6.8us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits, accumulated interest and penalties	5.3us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	5.1us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	4.5us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Deferred tax assets related to unrecognized tax benefits	3.6an_UnrecognizedTaxBenefitsDeferredTaxAssets	3.6an_UnrecognizedTaxBenefitsDeferredTaxAssets	5.5an_UnrecognizedTaxBenefitsDeferredTaxAssets
Net unrecognized tax benefits, associated interest, penalties and deferred tax asset that if resolved would impact effective tax rate	6.6us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	6.3us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	5.8us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Recognized interest and penalties	$ 0.3us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	$ 0.4us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	$ 0.3us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense

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Deferred tax assets associated with unrecognized tax benefits.

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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

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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 decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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