| **Income Taxes (Details) (USD $)In Millions, unless otherwise specified**                                              | 3 Months Ended | 9 Months Ended |
|------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Reconciliation of provision for income taxes computed at federal statutory rates to the effective rates [Abstract]** |           |           |   |   |
| Consolidated tax provision at federal statutory rate (in hundredths)                                                   | 35.00%         | 35.00%         | 35.00% | 35.00% |
| Reversal of tax credits (in hundredths)                                                                                | 0.00%          | 0.00%          | 0.00% | 5.90% |
| State income tax provisions, net of federal income tax benefit (in hundredths)                                         | 4.50%          | 9.60%          | 3.70% | 3.80% |
| Tax reserve adjustment (in hundredths)                                                                                 | (7.10%)        | (91.20%)       | (4.00%) | (8.10%) |
| All other, net (in hundredths)                                                                                         | 0.90%          | 1.40%          | 0.10% | 0.70% |
| Effective tax rate (in hundredths)                                                                                     | 33.30%         | (45.20%)       | 34.80% | 37.30% |
| Reversal of uncertain tax positions                                                                                    |           |           | $ 7.8 | $ 14.0 |
| Impact of charge resulting from increases in certain state tax laws                                                    |           |           | 10.5 |   |
| Amount of uncertain tax positions whose statute of limitations are expected to expire during the next twelve months    | $ 6.3          |           | $ 6.3 |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
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| - Definition
The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by reversal of tax credits under enacted tax laws during the period.
+ References
No definition available.
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| - Definition
Increase (decrease) in tax expense due to a charge resulting from the enactment of the Michigan Corporate Income Tax on May 25, 2011, which eliminated certain future tax deductions.
+ References
No definition available.
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| - Definition
The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in tax reserves.
+ References
No definition available.
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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.
+ References
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| - Definition
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.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
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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.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects the effects of adjustments of previously recorded tax expense, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, IRS tax settlement and unusual repatriation of foreign earnings.
+ References
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