Shareholders' Equity - SSAR Awards (Details) - SSAR Awards - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SSAR Awards
Balance at the beginning of the period (in shares)	0.3	0.5	1.3
Exercised (in shares)		(0.2)
Expired (in shares)	0.1		0.1
Forfeited (in shares)			(0.6)
Balance at the end of the period (in shares)	0.1	0.3	0.5	1.3
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share)	$ 26.09	$ 26.35	$ 28.78
Exercised (in dollars per share)		26.40
Expired (in dollars per share)	29.68		36.25
Forfeited (in dollars per share)			29.58
Balance at the end of the period (in dollars per share)	$ 23.39	$ 26.09	$ 26.35	$ 28.78
Aggregate Intrinsic Value	$ 0.6	$ 0.0	$ 0.8	$ 0.6
Weighted Average Remaining Contractual Life (in Years)	2 months 12 days	9 months 18 days	10 months 24 days	1 year 10 months 24 days
SSAR Awards Exercisable
SSAR Awards (in shares)	0.1	0.3	0.4	0.4
Weighted Average Exercise Price (in dollars per share)	$ 23.39	$ 26.09	$ 27.43	$ 29.18
Aggregate Intrinsic Value	$ 0.6	$ 0.0	$ 0.3	$ 0.2
Weighted Average Remaining Contractual Life (in Years)	2 months 12 days	9 months 18 days	6 months	1 year
Exercises in Period Intrinsic Value		$ 0.8