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Income Tax Matters, NOL (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 875.1
NOL carryforwards related to the excess tax benefits from vesting of employee restricted stock	1.7
AMT credit carryforwards	29.8
(Decrease) Increase in valuation allowance	(1.3)	2.1	(11.5)
US tax liability on undistributed earnings of the Canadian subsidiary	0
Income tax provision on undistributed foreign earnings	0
State of Illinois
Operating Loss Carryforwards [Line Items]
(Decrease) Increase in valuation allowance	$ (0.8)

The amount as of the balance sheet date of the estimated future tax effects attributable to undistributed earnings of subsidiaries and other recognized entities in countries outside the country of domicile which will increase future taxable income when such earnings are distributed into the country of domicile.

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- Definition

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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