Stock-Based Compensation (Schedule of Stock-based Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Assets:
Diversified investments associated with the ESU program, current	$ 4.3	$ 3.7
Diversified investments associated with the ESU program, long-term	55.9	51.4
Diversified investments associated with the ESU program, total	60.2	55.1
Liabilities:
Share liabilities, current	4.4	3.7
Share liabilities, long-term	8.2	9.0
Other - primarily timing differences between employee withholdings and related employer contributions to be submitted to various plans' trust accounts, current	5.0	5.5
Other - primarily timing differences between employee withholdings and related employer contributions to be submitted to various plans' trust accounts, long-term	0.0	0.0
Other - primarily timing differences between employee withholdings and related employer contributions to be submitted to various plans' trust accounts, total	5.0	5.5
Total liabilities associated with stock-based compensation, current	9.4	9.2
Total liabilities associated with stock-based compensation, long-term	60.6	51.2
Total liabilities associated with stock-based compensation, total	70.0	60.4
ESU program
Liabilities:
Share liabilities, current	4.4	3.7
Share liabilities, long-term	58.0	50.2
Share liabilities, total	62.4	53.9
PSU awards
Liabilities:
Share liabilities, current	0.0	0.0
Share liabilities, long-term	2.6	1.0
Share liabilities, total	$ 2.6	$ 1.0