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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

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