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Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Assets    
Trade receivables, allowances $ 79.1 $ 70.7
Contract with Customer, Asset, Allowance for Credit Loss, Current 1.5 1.6
Property and equipment, accumulated depreciation 1,157.4 1,039.1
Identified intangibles, with finite useful lives, accumulated amortization 661.0 563.0
Investments, Fair Value Disclosure $ 795.5 $ 740.8
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 52,120,548
Common Stock, Shares, Outstanding 47,471,625 47,509,750
Treasury Stock, Common, Shares 4,648,923 4,610,798
Commercial Paper    
Liabilities    
Unamortized Debt Issuance Expense $ 2.0 $ 0.0
Unamortized Debt Issuance Expense 2.0 0.0
Long-Term Senior Notes [Member]    
Liabilities    
Unamortized Debt Issuance Expense 6.8 8.1
Unamortized Debt Issuance Expense 6.8 8.1
Line of Credit [Member]    
Liabilities    
Unamortized Debt Issuance Expense 12.2 14.4
Unamortized Debt Issuance Expense $ 12.2 $ 14.4