Annual report pursuant to Section 13 and 15(d)

Other Benefit Plans (Details)

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Other Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]      
401I(k) plan contributions by employer $ 0.5 $ 0.4 $ 0.4
Deferred Compensation Liability 1.2 1.1  
Accrued benefit liability, prior CEO 1.5 1.6  
Prior CEO SERP current service cost 0.1 0.1 0.1
Officer SERP current service cost $ 0.3 $ 0.3 $ 0.3