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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 32.4 $ 34.0
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 750,000,000 750,000,000
Common stock, shares issued (in shares) 354,000,000.0 353,300,000
Common stock, shares outstanding (in shares) 354,000,000.0 353,300,000
Treasury stock, shares (in shares) 35,900,000 34,500,000