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CONSOLIDATED BALANCE SHEETS (unaudited) (Parentheticals) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 3.7 $ 3.6
Accumulated depreciation of property and equipment 616.6 656.9
Accumulated amortization of intangible assets 221.4 214.1
Accumulated amortization of other assets $ 79.3 $ 76.3
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 64,508,362 64,376,923
Treasury stock, shares 19,601,012 18,598,961