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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets
Trade receivables, allowances	$ 68.1	$ 52.0
Property and equipment, accumulated depreciation	660.7	588.3
Finite-Lived Intangible Assets, Accumulated Amortization	214.8	169.8
Investments, Fair Value Disclosure	$ 328.6	$ 247.3
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)	51,549,654	45,599,418
Common stock, shares outstanding (in shares)	51,549,654	45,599,418
Line of Credit [Member]
Liabilities and Equity
Unamortized Debt Issuance Expense	$ 12.3	$ 15.9
Long-Term Senior Notes [Member]
Liabilities and Equity
Unamortized Debt Issuance Expense	$ 3.1	$ 3.7

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