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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Income taxes receivable, current $ 49.0 $ 62.4
Common stock, shares issued 51,359,014 51,186,064
Common stock, shares outstanding 43,033,785 42,650,599
Common stock in treasury, shares 8,325,229 8,535,465