Other Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2011

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of 401 (k) Employer Contributions

For the years ended December 31, 2011, 2010 and 2009, we made contributions to the 401(k) plan as follows (in millions):

	Years Ended December 31,
	2011		2010		2009
401(k) plan contributions	$	0.5	$	0.4	$	0.4

Schedule of Deferred Compensation Liability

The deferred compensation liability at December 31, 2011 and 2010 was as follows (in millions):

	December 31,
	2011		2010
Deferred compensation liability	$	1.2	$	1.1

Schedule of Current Service Cost, Prior Executive

For the three years ended December 31, 2011, 2010 and 2009, we recognized current service cost as follows (in millions):

	Years Ended December 31,
	2011		2010		2009
Prior CEO SERP current service cost	$	0.1	$	0.1	$	0.1

Schedule of Current Service Cost, Current Officers

For the years ended December 31, 2011, 2010 and 2009, we recognized current service cost as follows (in millions):

	Years Ended December 31,
	2011		2010		2009
Officer SERP current service cost	$	0.3	$	0.3	$	0.3