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Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Assets    
Trade receivables, allowances $ 55.4 $ 51.3
Property and equipment, accumulated depreciation 544.2 514.9
Identified intangibles, with finite useful lives, accumulated amortization 183.2 165.9
Investments, Fair Value Disclosure $ 233.5 $ 242.3
Company shareholders' equity    
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 45,490,438 45,373,817
Common stock, shares outstanding (in shares) 45,490,438 45,373,817
Long-Term Senior Notes [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 4.2 $ 4.3
Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 14.2 $ 15.3