Income Taxes (Tables)

6 Months Ended

Jun. 30, 2011

Income Taxes (Tables) [Abstract]

Reconciliation of the change in unrecognized tax benefits

     A reconciliation of the change in our unrecognized tax benefits from December 31, 2010 to June 30, 2011 is as follows (in millions):

	Gross
	Unrecognized			Accrued
	Income Tax			Interest and
	Benefits			Penalties
Balance at December 31, 2010	$	12.6		$	1.1
Gross amount of increases in unrecognized tax benefits related to prior periods		23.5			—
Decreases in unrecognized tax benefits relating to settlements with taxing authorities		(24.4	)		—
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations		(3.2	)		(1.0	)
Balance at June 30, 2011	$	8.5		$	0.1