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Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax provision at the statutory rate	$ 56.8	$ 49.7	$ 42.9
State income taxes, net of federal benefit	13.3	11.5	9.4
Permanent difference – non deductible items	0.8	1.7	1.6
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount	(1.3)	(0.9)	(2.2)
Work opportunity tax credit	(2.0)	(2.5)	(3.1)
Tax Adjustments, Settlements, and Unusual Provisions	0.0	0.0	(3.0)
Other	2.8	2.5	0.6
Total	$ 70.4	$ 62.0	$ 46.2
U.S. federal statutory tax rate	21.00%	21.00%	21.00%

X

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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