Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 14.9 $ 13.9
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, authorized (in shares) 10,000,000.0 10,000,000.0
Preferred stock, issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 1.25 $ 1.25
Common stock, authorized (in shares) 300,000,000.0 300,000,000.0
Common stock, issued (in shares) 189,300,000 189,300,000
Common stock, outstanding (in shares) 122,300,000 122,100,000
Treasury stock (in shares) 66,400,000 66,600,000
Stock held by employee benefits trusts (in shares) 600,000 600,000