Income Taxes (Income Before Tax) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
United States	$ 347.6	$ 304.5	$ 237.6
Foreign	16.0	8.9	3.9
Income before income taxes	$ 363.6	$ 313.4	$ 241.5

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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