Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Line Items]
Valuation allowances	$ 49.1	$ 48.7
Unremitted earnings not taxed	17.5	17.7
Income tax reconciliation foreign withholding taxes	0.9	0.9
Unrecognized tax benefits	26.9	27.3	$ 35.6	$ 41.7
UTB if recognized, would impact the reported effective tax rate	12.8
UTB if recognized, would impact the reported effective tax rate, net of federal benefit	11.7
Interest and penalties reported as accrued income tax	2.3	1.7
Employee retention credit receivable			$ 5.9
Capital Loss Carryforward [Member]
Income Taxes [Line Items]
Capital loss carryforwards	$ 18.8	18.8
Minimum [Member]
Income Taxes [Line Items]
Number of open tax years subject to audit	3 years
Maximum [Member]
Income Taxes [Line Items]
Number of open tax years subject to audit	6 years
State [Member]
Income Taxes [Line Items]
Operating loss carryforwards	$ 646.7	$ 675.5
Valuation allowances	28.2
Estimated future taxable income to utilize deferred tax assets	240.9
Estimated future capital gain to realize capital loss carryforwards	$ 184.6
Estimated future capital gain to realize capital loss carryforwards, expiration year	2024
UTB decrease due to uncertain tax positions	$ 0.5
State [Member] | State Tax Credits [Member]
Income Taxes [Line Items]
Valuation allowances	$ 3.0
State [Member] | Minimum [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	2024
State [Member] | Maximum [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	2043
Estimated future capital gain to realize capital loss carryforwards, expiration year	2036
Federal [Member]
Income Taxes [Line Items]
Estimated future capital gain to realize capital loss carryforwards	$ 66.4
Federal [Member] | Minimum [Member]
Income Taxes [Line Items]
Estimated future capital gain to realize capital loss carryforwards, expiration year	2024
Federal [Member] | Maximum [Member]
Income Taxes [Line Items]
Estimated future capital gain to realize capital loss carryforwards, expiration year	2026
Federal and State [Member] | Capital Loss Carryforward [Member]
Income Taxes [Line Items]
Valuation allowances	$ 17.9