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Divestitures and Discontinued Operations (Summary of Financial Information for Discontinued Operations) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Discontinued operations, net of tax $ (11.1)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ (3.6)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ (4.2)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax