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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:                      
Federal                 $ 16.1 $ 2.6 $ 2.5
State and other                 14.9 12.2 10.8
Total current expense                 31.0 14.8 13.3
Deferred:                      
Federal                 130.5 113.9 95.3
State and other                 2.4 13.2 2.1
Total deferred expense                 132.9 127.1 97.4
Total income tax expense related to continuing operations $ 39.7 $ 42.1 $ 42.4 $ 39.7 $ 43.5 $ 35.9 $ 32.2 $ 30.3 $ 163.9 $ 141.9 $ 110.7