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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Jun. 30, 2014	Jun. 30, 2013
Income tax expense	$ 11.3	$ 5.4			$ 18.3	$ 3.0
Effective income tax rate, continuing operations	17.80%	17.20%			17.60%	8.30%
Unrecognized tax benefits, reductions resulting from lapse of applicable statute of limitations			1.5
Income tax expense (benefit), other						(3.3)
Unrecognized tax benefits, decreases resulting from settlements with taxing authorities		4.7
Net tax expense from amendment of state tax returns due to settlement of federal income tax audits				$ 1.3

X

- Definition

Income tax expense (benefit) recorded during the period that relates to certain discrete, unusual or infrequently occurring items.

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X

- Definition

Represents the impact on income tax expense for the first six months of 2012 due to the amendment of State income tax returns as a result of the settlement of federal income tax audits for certain tax years.

+ References

No definition available.

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- Definition

Percentage 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

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-SubTopic 10

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

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

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

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