Incentive Compensation Plans Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stock-based Payment Award
Award Vesting Period - Maximum	3 years
Employee Stock Option
Stock-based Payment Award
Stock options outstanding as of January 1, 2018	0.3
Stock options outstanding as of Jan 1, 2018, Weighted-average exercise price	$ 23.33
Exercised	(0.0)
Exercised, weighted-average exercise price	$ 0
Stock options outstanding as of December 31, 2018	0.3	0.3
Stock options outstanding as of Dec 31, 2018, Weighted-average exercise price	$ 23.33	$ 23.33
Options outstanding, weighted average remaining contractual term	6 years
Stock options outstanding, aggregate intrinsic value	$ 1.2
Performance-based awards
Stock-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0.0	0.0	0.0