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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 doubtful accounts $ 2.1 $ 1.3
Accumulated depreciation $ 131.8 $ 124.6
Common stock, par value (usd per share) $ 1 $ 1
Common stock, shares authorized (shares) 90,000,000 90,000,000
Common stock, shares issued (shares) 64,800,000 64,200,000
Treasury stock, shares (shares) 2,600,000 1,700,000