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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Accumulated depreciation $ 5,603.5 $ 5,038.9
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, authorized 15,000,000 15,000,000
Preferred stock, issued 0 0
Preferred stock, outstanding 0 0
Class A common stock    
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized 0 194,203,987
Common stock, issued 0 0
Common stock, outstanding 0 0
Class B common Stock    
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized 0 87,008,602
Common stock, issued 0 0
Common stock, outstanding 0 0
No class common stock    
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized 1,000,000,000 1,000,000,000
Common stock, issued 388,171,874 387,697,547
Common stock, outstanding 350,223,025 352,515,256