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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 9.6 $ 8.7
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, authorized shares (in shares) 50,000,000.0 50,000,000.0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 1.00 $ 1.00
Common stock, shares authorized (in shares) 1,050,000,000.0 1,050,000,000.0
Common stock, shares issued (in shares) 636,400,000 218,100,000
Common stock, shares outstanding (in shares) 624,300,000 209,100,000
Treasury stock, shares (in shares) 12,100,000 9,000,000.0