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Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Assets    
Trade receivables, allowances $ 77.4 $ 66.7
Contract with Customer, Asset, Allowance for Credit Loss, Current 2.0 1.9
Property and equipment, accumulated depreciation 1,009.6 960.5
Identified intangibles, with finite useful lives, accumulated amortization 532.4 445.8
Investments, Fair Value Disclosure $ 792.8 $ 794.9
Company shareholders' equity    
Common stock, par value (in dollars per share) $ 0.01  
Common stock, shares authorized (in shares) 100,000,000  
Common Stock, Shares, Issued 52,120,548 52,085,968
Common Stock, Shares, Outstanding 47,612,205 47,507,758
Treasury Stock, Common, Shares 4,508,343 4,578,210
Long-Term Senior Notes [Member]    
Unamortized Debt Issuance Expense $ 1.1 $ 1.2
Line of Credit [Member]    
Unamortized Debt Issuance Expense $ 8.6 $ 11.2