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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Assets    
Trade receivables, allowances $ 66.7 $ 67.6
Contract with Customer, Asset, Allowance for Credit Loss, Current 1.9 2.5
Property and equipment, accumulated depreciation 960.5 909.1
Finite-Lived Intangible Assets, Accumulated Amortization 445.8 340.1
Investments, Fair Value Disclosure $ 794.9 $ 639.6
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) 52,085,968 52,076,800
Common stock, shares outstanding (in shares) 47,507,758 50,024,139
Treasury Stock, Shares 4,578,210 2,052,661
Long-term senior notes, 4.4%, due November 2022 [Member]    
Unamortized Debt Issuance Expense $ 0.0 $ 0.3
Liabilities and Equity    
Unamortized Debt Issuance Expense 0.0 0.3
Line of Credit [Member]    
Unamortized Debt Issuance Expense 11.2 11.8
Liabilities and Equity    
Unamortized Debt Issuance Expense 11.2 11.8
Long-Term Senior Notes [Member]    
Unamortized Debt Issuance Expense 1.2 1.4
Liabilities and Equity    
Unamortized Debt Issuance Expense $ 1.2 $ 1.4