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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
Federal statutory rate $ 9.9 $ (22.3)
Adjustment to valuation allowances (17.1) 13.1
Impairment on investment in Plural 6.2 0.0
Impact from foreign branches 4.5 2.1
Adjustment of deferred tax liabilities 3.5 2.0
Foreign rate differential (1.9) (1.3)
Adjustment of uncertain tax positions 0.2 0.8
State taxes, net of federal benefit (0.1) 15.4
Benefit of Net Operating Loss Carryback 0.0 (14.3)
Other 4.3 4.8
Total income tax expense $ 9.5 $ 0.3