Stock-Based Compensation (Fair Value and Tax Deductions of Restricted Stock Units Vested) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Realized tax benefits from tax deductions	$ 5.2	$ 0.6	$ 5.7
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares or units distributed	15.0	9.7	11.0
Realized tax benefits from tax deductions	$ 3.7	$ 2.4	$ 2.7