Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Valuation allowances	$ 75.5	$ 79.6
Estimated future taxable income to realize foreign tax credits	$ 62.4
Estimated future taxable income to realize foreign tax credits, expiration year	2028
Estimated future capital gain to realize capital loss carryforwards	$ 56.2
Estimated future capital gain to realize capital loss carryforwards, expiration year	2034
Unremitted earnings not taxed	$ 14.0	208.0
Income tax reconciliation foreign withholding taxes	0.8	2.2
Unrecognized tax benefits	34.7	42.6	$ 53.4	$ 86.9
UTB if recognized, would impact the reported effective tax rate	17.2
UTB if recognized, would impact the reported effective tax rate, net of federal benefit	16.1
Interest and penalties reported as accrued income tax	2.2
Capital Loss Carryforward [Member]
Income Taxes [Line Items]
Capital loss carryforwards	$ 16.0
Minimum [Member]
Income Taxes [Line Items]
Number of open tax years subject to audit	3 years
Minimum [Member] | Capital Loss Carryforward [Member]
Income Taxes [Line Items]
Tax credit carryforward, expiration year	2024
Maximum [Member]
Income Taxes [Line Items]
Number of open tax years subject to audit	6 years
Maximum [Member] | Capital Loss Carryforward [Member]
Income Taxes [Line Items]
Tax credit carryforward, expiration year	2034
State [Member]
Income Taxes [Line Items]
Operating loss carryforwards	$ 897.3	954.5
Valuation allowances	46.4
Estimated future taxable income to utilize deferred tax assets	681.6
UTB decrease due to uncertain tax positions	$ 0.6
State [Member] | Minimum [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	2020
State [Member] | Maximum [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	2039
Federal [Member]
Income Taxes [Line Items]
Tax credit carryforward gross	$ 13.1	$ 19.1
Valuation allowances	13.1
UTB increase due to uncertain tax positions	$ 1.8
Federal [Member] | Minimum [Member]
Income Taxes [Line Items]
Tax credit carryforward, expiration year	2020
Federal [Member] | Maximum [Member]
Income Taxes [Line Items]
Tax credit carryforward, expiration year	2028
Federal and State [Member] | Capital Loss Carryforward [Member]
Income Taxes [Line Items]
Valuation allowances	$ 16.0