Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax provision at the statutory rate	$ 49.7	$ 42.9	$ 69.0
State income taxes, net of federal benefit	11.5	9.4	6.8
Permanent difference – non deductible items	1.7	1.6	1.9
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount	(0.9)	(2.2)	(4.2)
Work opportunity tax credit	(2.5)	(3.1)	(2.0)
Tax Adjustments, Settlements, and Unusual Provisions	0.0	(3.0)	(31.4)
Other	2.5	0.6	(0.9)
Total	$ 62.0	$ 46.2	$ 39.2