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Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets
Trade receivables, allowances	$ 73.6	$ 66.5
Contract with Customer, Asset, Allowance for Credit Loss, Current	2.1	1.8
Property and equipment, accumulated depreciation	889.8	806.2
Identified intangibles, with finite useful lives, accumulated amortization	323.0	295.3
Investments, Fair Value Disclosure	$ 537.7	$ 340.3
Company shareholders' equity
Common stock, par value (in dollars per share)	$ 0.01
Common stock, shares authorized (in shares)	100,000,000
Common Stock, Shares, Issued	52,076,276	51,970,307
Common Stock, Shares, Outstanding	50,582,197	51,105,417
Treasury Stock, Shares	1,494,079	864,890
Long-Term Senior Notes [Member]
Unamortized Debt Issuance Expense	$ 2.0	$ 2.5
Line of Credit [Member]
Unamortized Debt Issuance Expense	$ 12.8	$ 8.7

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