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Segment Information - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]    
Total assets $ 4,010.3 $ 4,023.6
Operating segments | U.S.    
Segment Reporting Information [Line Items]    
Total assets 3,675.1 3,704.2
Operating segments | International    
Segment Reporting Information [Line Items]    
Total assets 244.7 270.4
Corporate    
Segment Reporting Information [Line Items]    
Total assets $ 90.5 $ 49.0