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Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Assets    
Trade receivables, allowances $ 74.5 $ 67.6
Contract with Customer, Asset, Allowance for Credit Loss, Current 2.7 2.5
Property and equipment, accumulated depreciation 944.3 909.1
Identified intangibles, with finite useful lives, accumulated amortization 394.2 340.1
Investments, Fair Value Disclosure $ 786.1 $ 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 52,084,171 52,076,800
Common Stock, Shares, Outstanding 48,240,672 50,024,139
Treasury Stock, Shares 3,843,499 2,052,661
Long-term senior notes, 4.4%, due November 2022 [Member]    
Unamortized Debt Issuance Expense $ 0.2 $ 0.3
Long-Term Senior Notes [Member]    
Unamortized Debt Issuance Expense 1.4 1.4
Line of Credit [Member]    
Unamortized Debt Issuance Expense $ 10.7 $ 11.8