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Income Taxes - Components of Provision for Income Tax Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 72.2 | $ 16.1 | $ 2.6
State and other |  |  |  |  |  |  |  |  | 12.8 | 14.9 | 12.2
Total current expense |  |  |  |  |  |  |  |  | 85.0 | 31.0 | 14.8
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 74.2 | 130.5 | 113.9
State and other |  |  |  |  |  |  |  |  | 1.4 | 2.4 | 13.2
Total deferred expense |  |  |  |  |  |  |  |  | 75.6 | 132.9 | 127.1
Total income tax expense related to continuing operations | $ 49.2 | $ 43.1 | $ 28.6 | $ 39.7 | $ 39.7 | $ 42.1 | $ 42.4 | $ 39.7 | $ 160.6 | $ 163.9 | $ 141.9

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