Shareholders' Equity - RSU Awards and SSAR Awards (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SSAR Awards Exercisable
Aggregate intrinsic value of SSAR Awards exercised		$ 0.9
RSUs
Awards Outstanding
Balance at the beginning of the period (in shares)	1.7	1.8	1.2
Granted (in shares)	2.1	0.7	1.2
Vested (in shares)	(0.6)	(0.5)	(0.4)
Forfeited (in shares)	(0.3)	(0.3)	(0.2)
Balance at the end of the period (in shares)	3.0	1.7	1.8	1.2
Weighted Average Grant Date Fair Value Price
Balance at the beginning of the period (in dollars per share)	$ 27.30	$ 25.17	$ 32.50
Granted (in dollars per share)	25.86	33.08	23.30
Vested (in dollars per share)	27.27	27.34	36.12
Forfeited (in dollars per share)	25.97	28.55	32.56
Balance at the end of the period (in dollars per share)	$ 26.41	$ 27.30	$ 25.17	$ 32.50
Aggregate Intrinsic Value	$ 81.4	$ 46.3	$ 57.1	$ 53.2
Weighted Average Remaining Contractual Life (in Years)	1 year 7 months 6 days	1 year 2 months 12 days	1 year 3 months 18 days	10 months 24 days
Aggregate intrinsic value of awards issued	$ 14.8	$ 18.1	$ 10.8
Vesting period of outstanding equity awards	3 years
Weighted average fair value (in dollars per share)	$ 33.45
Expected term	3 years
Volatility	52.20%
Risk-free interest rates	4.10%
SSAR Awards
Granted (in shares)	0.5
SSAR Awards
Weighted Average Grant Date Fair Value Price
Aggregate Intrinsic Value	$ 0.8	$ 0.6	$ 7.3	$ 31.3
Weighted Average Remaining Contractual Life (in Years)	10 months 24 days	1 year 10 months 24 days	2 years 6 months	3 years 4 months 24 days
SSAR Awards
Balance at the beginning of the period (in shares)	1.3	2.3	2.2
Granted (in shares)	0.0	0.0	0.1
Exercised (in shares)	0.0	(0.1)	0.0
Expired (in shares)	(0.1)
Forfeited (in shares)	(0.6)	(1.0)	0.0
Balance at the end of the period (in shares)	0.5	1.3	2.3	2.2
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share)	$ 28.78	$ 29.08	$ 29.72
Granted (in dollars per share)	0	0	23.39
Exercised (in dollars per share)	0	24.89	0
Expired (in dollars per share)	36.25
Forfeited (in dollars per share)	29.58	29.91	57.48
Balance at the end of the period (in dollars per share)	$ 26.35	$ 28.78	$ 29.08	$ 29.72
SSAR Awards Exercisable
SSAR Awards (in shares)	0.4	0.4	0.2	0.1
Weighted Average Exercise Price (in dollars per share)	$ 27.43	$ 29.18	$ 41.85	$ 50.12
Aggregate Intrinsic Value	$ 0.3	$ 0.2	$ 0.0	$ 0.0
Weighted Average Remaining Contractual Life (in Years)	6 months	1 year	9 months 18 days	1 year 1 month 6 days