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Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets
Trade receivables, allowances	$ 81.3	$ 68.1
Contract with Customer, Asset, Allowance for Credit Loss, Current	2.8
Property and equipment, accumulated depreciation	775.9	660.7
Identified intangibles, with finite useful lives, accumulated amortization	277.0	214.8
Investments, Fair Value Disclosure	$ 299.0	$ 328.6
Company shareholders' equity
Treasury Stock, Common, Shares	429,617
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	51,968,753	51,549,654
Common Stock, Shares, Outstanding	51,539,136	51,549,654
Long-Term Senior Notes [Member]
Line of Credit Facility [Line Items]
Unamortized Debt Issuance Expense	$ 2.7	$ 3.1
Line of Credit [Member]
Line of Credit Facility [Line Items]
Unamortized Debt Issuance Expense	$ 9.6	$ 12.3

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