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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Mar. 31, 2019
Dec. 31, 2018
Current assets    
Allowance for doubtful accounts $ 4.4 $ 4.4
Stockholders' equity    
Treasury stock, shares (in shares) 30.4 27.3
Convertible Preferred Stock    
Stockholders' equity    
Preferred stock, par value per share (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 0.0 0.0
Preferred stock, shares issued (in shares) 0.0 0.0
Preferred stock, shares outstanding (in shares) 0.0 0.0
Preferred Stock    
Stockholders' equity    
Preferred stock, par value per share (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 100.0 100.0
Preferred stock, shares issued (in shares) 0.0 0.0
Preferred stock, shares outstanding (in shares) 0.0 0.0
Series Common Stock    
Stockholders' equity    
Common stock, par value per share (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 50.0 50.0
Common stock, shares issued (in shares) 0.0 0.0
Common stock, shares outstanding (in shares) 0.0 0.0
Common Stock    
Stockholders' equity    
Common stock, par value per share (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 450.0 450.0
Common stock, shares issued (in shares) 137.9 137.7
Common stock, shares outstanding (in shares) 107.5 110.4