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Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Assets    
Trade receivables, allowances $ 32.6 $ 23.2
Property and equipment, accumulated depreciation 478.3 449.2
Identified intangibles, with finite useful lives, accumulated amortization 156.6 139.0
Investments, Fair Value Disclosure $ 203.8 155.2
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense   $ 18.1
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 (in shares) 45,127,286 45,049,503
Common stock, shares outstanding (in shares) 45,127,286 45,049,503
Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 21.5 $ 15.4
Long-Term Senior Notes [Member]    
Line of Credit Facility [Line Items]    
Unamortized Debt Issuance Expense $ 2.5 $ 2.7