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Share-Based Compensation Plans (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) installment shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	May 18, 2021 shares	Jan. 02, 2008 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 8.3	$ 13.6	$ 11.0
Deferred income tax benefits for stock options and restricted stock	0.7	1.7	1.4
Total intrinsic value	$ 5.8	8.0	$ 17.7
Restricted shares vesting (as a percent)	8.33%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
Unrecognized compensation expense	$ 0.3
Weighted-average period	9 months 14 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Total fair value of vested restricted shares	$ 2.9
Restricted Stock [Member] \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Time-Vested Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Award vesting installments \| installment	4
Performance-Vested Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	2 years
Award vesting installments \| installment	1
Period of earned awards become vested	90 days
Award performance measurement period	2 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 12.1
Weighted-average period	1 year 3 months 18 days
Total fair value of vested restricted shares	$ 11.6	$ 0.5
Minimum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Minimum \| Performance-Vested Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage of target grant amount	0.00%
Maximum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Maximum \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares vesting (as a percent)	100.00%
Maximum \| Performance-Vested Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage of target grant amount	200.00%
2007 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) \| shares					17,000,000
Two Thousand Twenty-One Equity Incentive Plan Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) \| shares				23,100,000
Number of shares reserved for issuance (in shares) \| shares				22,800,000
Number of shares available for grant (in shares) \| shares	20,600,000