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Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
PROPERTY AND EQUIPMENT, accumulated depreciation $ 1,040.8 $ 1,009.8
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 1,500,000,000 1,500,000,000
Common stock, shares issued 120,562,149 120,562,149
Treasury stock, shares 17,461,420 9,758,091