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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Assets
Trade receivables, allowances	$ 52.0	$ 51.3
Property and equipment, accumulated depreciation	588.3	514.9
Finite-Lived Intangible Assets, Accumulated Amortization	169.8	165.9
Investments, Fair Value Disclosure	$ 247.3	$ 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 (in shares)	45,599,418	45,373,817
Common stock, shares outstanding (in shares)	45,599,418	45,373,817
Line of Credit [Member]
Liabilities and Equity
Unamortized Debt Issuance Expense	$ 15.9	$ 15.3
Long-Term Senior Notes [Member]
Liabilities and Equity
Unamortized Debt Issuance Expense	$ 3.7	$ 4.3

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