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Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Intangibles	$ (127.5)	$ (145.4)
Depreciation expense	(11.4)	(14.3)
Operating lease right-of-use assets	(14.8)	(22.1)
Operating lease liabilities	15.6	23.3
Allowance for doubtful accounts	1.5	1.4
Employee-related accruals	20.5	14.8
Stock-based compensation	10.0	8.4
Payroll tax deferral	10.5	22.5
Other	6.6	2.9
Deferred Tax Liabilities, net of deferred tax assets and valuation allowance	$ (89.0)	$ (108.5)

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