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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:                      
Federal                 $ 103.8 $ 72.2 $ 16.1
State and other                 24.2 12.8 14.9
Total current expense                 128.0 85.0 31.0
Deferred:                      
Federal                 (13.7) 58.4 130.5
State and other                 4.6 2.4 2.4
Total deferred expense                 (9.1) 60.8 132.9
Total income tax expense related to continuing operations $ 29.4 $ 30.2 $ 29.3 $ 30.0 $ 34.4 $ 43.1 $ 28.6 $ 39.7 $ 118.9 $ 145.8 $ 163.9