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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Assets    
Trade receivables, allowances $ 51.3 $ 37.1
Property and equipment, accumulated depreciation 514.9 488.0
Finite-Lived Intangible Assets, Accumulated Amortization 165.9 180.6
Investments, Fair Value Disclosure $ 242.3 $ 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 (in shares) 45,373,817 45,213,832
Common stock, shares outstanding (in shares) 45,373,817 45,213,832
Line of Credit [Member]    
Liabilities and Equity    
Unamortized Debt Issuance Expense $ 15.3 $ 19.6
Long-Term Senior Notes [Member]    
Liabilities and Equity    
Unamortized Debt Issuance Expense $ 4.3 $ 2.3