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CONSOLIDATED BALANCE SHEETS (unaudited) (Parentheticals) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 4.6 $ 4.0
Accumulated depreciation of property and equipment 624.0 576.4
Accumulated amortization of intangible assets 213.6 199.2
Accumulated amortization of other assets $ 72.6 $ 68.0
Preferred stock, par value per share $ 0.02 $ 0.02
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Common stock, par value per share $ 0.02 $ 0.02
Common stock, shares authorized 90,000,000 90,000,000
Common stock, shares issued 64,194,917 64,091,387
Treasury stock, shares 14,539,373 14,269,645