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Income Taxes - Income Tax Provision (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 30.3	$ 95.1	$ 68.1
State	11.5	16.9	13.8
Current income tax expense (benefit)	41.8	112.0	81.9
Deferred:
Federal	20.4	(14.2)	4.9
State	9.6	4.1	(0.4)
Deferred income tax expense (benefit)	30.0	(10.1)	4.5
Total	$ 71.8	$ 101.9	$ 86.4

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