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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Assets    
Trade receivables, allowances $ 70.7 $ 66.7
Contract with Customer, Asset, Allowance for Credit Loss, Current 1.6 1.9
Property and equipment, accumulated depreciation 1,039.1 960.5
Finite-Lived Intangible Assets, Accumulated Amortization 563.0 445.8
Investments, Fair Value Disclosure $ 740.8 $ 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 (in shares) 52,120,548 52,085,968
Common stock, shares outstanding (in shares) 47,509,750 47,507,758
Treasury Stock, Shares 4,610,798 4,578,210
Line of Credit [Member]    
Liabilities and Equity    
Unamortized Debt Issuance Expense $ 14.4 $ 11.2
Long-Term Senior Notes [Member]    
Liabilities and Equity    
Unamortized Debt Issuance Expense $ 8.1 $ 1.2