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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Preferred stock, shares authorized 100,000,000.0 100,000,000.0
Preferred stock, shares issued 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 600,000,000.0 600,000,000.0
Common stock, shares issued 198,800,000 198,800,000
Treasury stock (in shares) 68,300,000 66,900,000