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Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions | 12 Months Ended
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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%

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117330312&loc=d3e23163-113944 + Details
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