Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

Our net income is expected to be impacted as follows:

	Year Ended December 31
	2011						2010						2009
	(in millions)			per share*			(in millions)			per share*			(in millions)			per share*
Net Income, Before Adoption	$	235.4		$	0.78		$	886.1		$	2.71		$	852.6		$	2.57
After-tax Impact of Adoption,
Excluding Impact from Impairment of
Deferred Acquisition Costs - Note 5	(12.1		)	(0.04		)	(7.4		)	(0.02		)	(5.3		)	(0.02		)
After-tax Impairment of Deferred Acquisition Costs
Before Adoption	188.4			0.62			—			—			—			—
After Adoption	(127.5		)	(0.42		)	—			—			—			—
Net Income, After Adoption	$	284.2		$	0.94		$	878.7		$	2.69		$	847.3		$	2.55
* Assuming Dilution