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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Allowance for bad debt $ 1.7 $ 0.0
Property and equipment, accumulated depreciation 1,671.1 1,426.3
Intangible assets, accumulated amortization $ 42.9 $ 36.5