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Accounting Policies - Background and Basis of Presentation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Restructuring Cost and Reserve [Line Items]        
Selling and general expenses $ 111.3 $ 82.5 $ 298.1 $ 266.9