v2.4.0.6
Employee Benefit Plans (Details 10) (Limited Partnerships [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Limited Partnerships [Member]
 
Changes in the fair value of the Plan's investment in Level 3 assets  
Balance, beginning of the year $ 0.5
Purchases, sales, issuances and settlements, (net) (0.1)
Balance, end of the year $ 0.4