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Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Assets    
Trade receivables, allowances $ 69.0 $ 68.1
Contract with Customer, Asset, Accumulated Allowance for Credit Loss, Current 1.8  
Property and equipment, accumulated depreciation 685.6 660.7
Identified intangibles, with finite useful lives, accumulated amortization 236.1 214.8
Investments, Fair Value Disclosure $ 302.0 $ 328.6
Company shareholders' equity    
Treasury Stock, Common, Shares 187,753  
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common Stock, Shares, Issued 51,810,592 51,549,654
Common Stock, Shares, Outstanding 51,622,839 51,549,654
Long-Term Senior Notes [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 2.9 $ 3.1
Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 11.4 $ 12.3