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Other Intangible Assets (Amortization Expense) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense $ 4.8us-gaap_AmortizationOfIntangibleAssets $ 3.5us-gaap_AmortizationOfIntangibleAssets $ 2.5us-gaap_AmortizationOfIntangibleAssets