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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Assets    
Allowance for doubtful accounts $ 14.4 $ 12.2
Stockholders' equity    
Common stock, shares authorized (shares) 400,000,000.0 400,000,000.0
Common stock, shares issued (shares) 265,100,000 261,900,000
Treasury shares (shares) 24,300,000 15,200,000