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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal									$ 58.1	$ 103.8	$ 72.2
State and other									17.8	24.2	12.8
Total current expense									75.9	128.0	85.0
Deferred:
Federal									32.0	(13.7)	58.4
State and other									8.0	4.6	2.4
Total deferred expense (benefit)									40.0	(9.1)	60.8
Total income tax expense related to continuing operations	$ 27.3	$ 34.3	$ 23.5	$ 30.8	$ 29.4	$ 30.2	$ 29.3	$ 30.0	$ 115.9	$ 118.9	$ 145.8

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