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Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Assets
Trade receivables, allowances	$ 79.0	$ 68.1
Contract with Customer, Asset, Allowance for Credit Loss, Current	1.7
Property and equipment, accumulated depreciation	730.2	660.7
Identified intangibles, with finite useful lives, accumulated amortization	256.9	214.8
Investments, Fair Value Disclosure	$ 304.1	$ 328.6
Company shareholders' equity
Treasury Stock, Common, Shares	183,474
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	51,825,529	51,549,654
Common Stock, Shares, Outstanding	51,642,055	51,549,654
Long-Term Senior Notes [Member]
Line of Credit Facility [Line Items]
Unamortized Debt Issuance Expense	$ 2.8	$ 3.1
Line of Credit [Member]
Line of Credit Facility [Line Items]
Unamortized Debt Issuance Expense	$ 10.5	$ 12.3

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