Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Income Taxes [Abstract]
Consolidated tax provision at federal statutory rate (in hundredths)	35.00%		35.00%	35.00%	35.00%
Reversal of tax credits	14.80%			6.40%
State income tax provisions, net of federal income tax benefit (in hundredths)	3.50%		0.90%	3.80%	1.30%
All other, net (in hundredths)	(0.90%)		(4.60%)	(0.20%)	1.60%
Effective tax rate (in hundredths)	52.40%		31.30%	45.00%	37.90%
Charge resulting from the elimination of future relief credits by the state of Michigan		$ 10.5		$ 10.5
Income tax charge resulting from health care reform legislation					4.1
Amount of uncertain tax positions whose statute of limitations are expected to expire during the next twelve months	$ 17.4			$ 17.4

Change in state tax by the state of Michigan, eliminating certain future tax deductions.

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Increase or decrease in income tax expense or benefit resulting from health care reform legislation associated with the passage of the Patient Protection and Affordable Care Act and of the Health Care and Education Reconciliation Act of 2010 (the Acts) enacted in March 2010

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- Definition

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 sum of the differences between the effective income tax rate and domestic federal statutory income tax rate that can be explained by all tax credits generated or utilized under enacted tax laws during the period.

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- Definition

The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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