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Income Taxes - Reconciliation Between Income Tax Expenses (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Line Items]      
Computed statutory tax expense $ (55.7) $ (92.2) $ (194.7)
State and local income taxes, net of federal income tax impact (2.2) (1.4) (1.2)
Changes in valuation allowance 60.6 76.3 46.7
Foreign tax rate differential 1.3 (4.5) (6.6)
Foreign tax credits (4.0)    
Impacts related to COVID-19 pandemic [1]     (187.5)
Changes in uncertain tax positions 1.6 7.5 24.9
Other, net 1.4 (2.5) 9.0
Income taxes 3.0 (16.8) (309.4)
CUSA      
Income Taxes [Line Items]      
Computed statutory tax expense (50.8) (86.6) (191.3)
State and local income taxes, net of federal income tax impact (4.2) (0.7) (1.2)
Changes in valuation allowance 41.8 54.3 46.7
Foreign tax rate differential 1.3 (4.5) (6.6)
Foreign tax credits (4.0) 0.0 0.0
Impacts related to COVID-19 pandemic [2] 0.0 (185.1)
Changes in uncertain tax positions 1.6 5.7 24.9
Other, net 1.2 (0.5) (9.0)
Income taxes $ (13.1) $ (32.3) $ (303.6)
[1] The amount for the year ended December 31, 2020 includes benefits of a rate differential on earnings of $123.0, tax losses with respect to investments in foreign subsidiaries and a write down of certain intercompany receivables associated with the Company’s foreign subsidiaries of $135.6, offset by a tax charge for the remeasurement of deferred taxes and tax attributes of $49.9 and dislodged foreign tax credits not benefited of $21.2.
[2] The amount for the year ended December 31, 2020 includes benefits of a rate differential on earnings of $120.7, tax losses with respect to investments in foreign subsidiaries and a write down of certain intercompany receivables associated with the Company’s foreign subsidiaries of $135.6, offset by a tax charge for the remeasurement of deferred taxes and tax attributes of $49.9 and dislodged foreign tax credits not benefited of $21.2.