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Acquisitions (Schedule of Purchase Price Allocation) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Business Acquisition [Line Items]        
Goodwill $ 1,192.8us-gaap_Goodwill $ 1,178.7us-gaap_Goodwill $ 1,192.4us-gaap_Goodwill $ 1,194.5us-gaap_Goodwill