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Income Taxes - Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal tax provision at statutory rate	$ 70.9	$ 121.5	$ 99.2
State taxes, net of federal income tax benefit	16.1	13.3	10.8
Equity investment basis difference	0.0	0.0	9.5
Non-deductible items	1.5	1.3	1.4
Permanent differences related to stock-based compensation	(0.1)	(0.8)	0.1
Net change in valuation allowance	0.5	0.3	(5.1)
General business credits	(1.1)	(0.9)	(28.0)
Deferred revaluation for change in statutory tax rate	(15.8)	(32.9)	0.0
Other	(0.2)	0.1	(1.5)
Total	$ 71.8	$ 101.9	$ 86.4

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