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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Income taxes receivable, current $ 41.8 $ 62.4
Common stock, shares issued 51,284,268 51,186,064
Common stock, shares outstanding 42,948,462 42,650,599
Common stock in treasury, shares 8,335,806 8,535,465