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Income Taxes Components of Income Tax Provision From Continuing Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current:      
Federal $ 86.0 $ 93.0 $ 190.6
State 29.4 26.8 29.4
Federal and state deferred 45.8 10.9 (22.1)
Change in valuation allowance, net 0.2 3.5 3.3
Adjustments and settlements 0.4 (0.7) 0.3
Income tax provision $ 161.8 $ 133.5 $ 201.5