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Income Taxes, Capital Loss and Tax Credit Carryforwards (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2012	Dec. 31, 2010
Capital Loss Carryforwards [Line Items]
Valuation allowance on deferred tax asset			$ 1.2
Deferred tax asset			2.7
Reversal of valuation allowance	1.2
Tax credit carryforwards		$ 68.5
Expiration date		Jan. 01, 2029

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards.

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- Definition

The cumulative amount of future tax effects arising from the unused tax credit carryforward that cannot be utilized on the tax return during a year that may be carried forward to reduce taxable income or taxes payable in a future year; a tax credit carryforward is the amount by which tax credits available for utilization exceed statutory limitations.

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