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Acquisitions and Dispositions - 2013 Acquisitions Pro Forma Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition [Line Items]                        
Revenue from Consolidated Statements of Operations and Comprehensive Loss $ 737.0 $ 671.6 $ 691.5 $ 658.7 $ 565.8 $ 415.6 $ 416.9 $ 388.1 $ 2,758.8 $ 1,786.4 $ 1,090.9 $ 928.6
Unaudited pro forma revenue                   2,945.9 3,016.9 1,617.1
WMS Acquisition                        
Business Acquisition [Line Items]                        
Revenue not reflected in Statements of Operations and Comprehensive Loss                   $ 0.0 $ 567.4 $ 688.5