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Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of reconciliation between statutory tax rate and effective tax rate
Statutory federal rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefits	4.30%	4.30%	4.40%
Non-taxable interest income			(0.10%)
Other	0.20%	0.30%	0.20%
Effective tax rate	39.50%	39.60%	39.50%
Income Taxes (Textual)
Cash payments for income taxes	$ 47.4	$ 67.0	$ 81.6

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense or benefit, net of the federal tax benefit (expense) thereon, recorded during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to income that is exempt from income taxes under enacted tax laws.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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