XML 35 R41.htm IDEA: XBRL DOCUMENT v2.4.0.8
3. Fair Value and Gross Unrealized Losses with Unrealized Losses (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Dec. 31, 2012
Tolerable variance Level 2 debt security pricing   1.00%  
Fair Value of Investments with Gross Unrealized Losses in loss position 12 months or more $ 2.1 $ 2.1 $ 0.3
Gross unrealized losses for investments in a loss position 12 months or more 0.1   0.1
Gross unrealized losses for investments in a loss position less than 12 months 0.8   0.5
Cost Method Investment, Percentage Owned 35.00% 35.00%  
Fair Value of Investments with Gross Unrealized Losses in loss position less than 12 months $ 92.3 $ 92.3 $ 99.0