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Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Assets    
Trade receivables, allowances $ 51.8 $ 37.1
Property and equipment, accumulated depreciation 544.0 488.0
Identified intangibles, with finite useful lives, accumulated amortization 159.0 180.6
Investments, Fair Value Disclosure $ 234.2 $ 212.7
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 45,361,956 45,213,832
Common stock, shares outstanding (in shares) 45,361,956 45,213,832
Long-Term Senior Notes [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 4.5 $ 2.3
Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 16.4 $ 19.6