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Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Trade receivables, allowances | $ 60.0 | $ 51.3
Property and equipment, accumulated depreciation | 563.6 | 514.9
Identified intangibles, with finite useful lives, accumulated amortization | 186.3 | 165.9
Investments, Fair Value Disclosure | $ 238.7 | $ 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 | 45,495,171 | 45,373,817
Common stock, shares outstanding (in shares) | 45,495,171 | 45,373,817
Long-Term Senior Notes [Member] |  |
Line of Credit Facility [Line Items] |  |
Unamortized Debt Issuance Expense | $ 4.0 | $ 4.3
Line of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Unamortized Debt Issuance Expense | $ 17.8 | $ 15.3

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