Stock-Based Compensation (Share-Based Payment Arrangement, Expensed and Capitalized, Amount) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Employee Stock Option
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Payment Arrangement, Expense	$ 4.0	$ 4.1	$ 4.2
Share-Based Payment Arrangement, Expense, Tax Benefit	1.0	1.1	1.1
Share-Based Payment Arrangement, Amount Capitalized	1.9	1.9	1.7
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Payment Arrangement, Expense	24.4	22.2	23.2
Share-Based Payment Arrangement, Expense, Tax Benefit	6.2	5.7	5.9
Share-Based Payment Arrangement, Amount Capitalized	11.3	9.7	9.2
Long Term Performance Unit [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Payment Arrangement, Expense	12.0	11.1	16.0
Share-Based Payment Arrangement, Expense, Tax Benefit	3.1	2.8	4.1
Share-Based Payment Arrangement, Amount Capitalized	5.7	5.2	6.7
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Payment Arrangement, Expense	2.5	2.8	2.0
Share-Based Payment Arrangement, Expense, Tax Benefit	0.6	0.7	0.5
Share-Based Payment Arrangement, Amount Capitalized	$ 1.2	$ 1.2	$ 0.8