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Income Taxes - Components of Income Tax Expense From Continuing Operations (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Federal income taxes: |  |  |
Current | $ 66.3 | $ 91.9 | $ 83.9
Deferred | 61.4 | 45.4 | 31.1
Total federal income taxes | 127.7 | 137.3 | 115.0
State income taxes: |  |  |
Current | 18.7 | 21.0 | 20.5
Deferred | 6.5 | 8.7 | (1.5)
Total state income taxes | 25.2 | 29.7 | 19.0
Foreign income taxes: |  |  |
Current |  | 1.2 | 2.8
Deferred | 0.3 |  | (0.5)
Total foreign income taxes | 0.3 | 1.2 | 2.3
Income tax expense | $ 153.2 | $ 168.2 | $ 136.3

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