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Acquisitions and Dispositions - 2013 Acquisitions Pro Forma Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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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

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