Income Taxes (Summary of Income Tax Contingencies) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Gross unrecognized tax benefits:
Gross unrecognized income tax benefits, beginning of period	$ 246.4	$ 227.9
Additions for tax positions of the current year	51.7	43.0
Additions for tax positions of prior years	3.9	8.4
Reductions for tax positions of prior years for:
Changes in judgments	(6.5)	3.2
Settlements during the year	(0.6)	(19.1)
Lapses of applicable statute of limitations	(1.2)	(0.6)
Foreign currency translation and other	(12.0)	(16.4)
Gross unrecognized income tax benefits, end of period	$ 281.7	$ 246.4