Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details)

v2.4.0.6
Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Summary of Significant Accounting Policies (Textual) [Abstract]          
Interest-bearing instruments with original maturities date of purchase, Maximum     90 days    
Interest-bearing instruments with original maturities date of purchase, Minimum     90 days    
Interest-bearing instruments with remaining maturities date of purchase, Maximum     1 year    
Other revenues $ 0.2   $ 0.4    
Total deferred revenue related to other revenues 1.7   1.7   0.9
Amount of allowance for doubtful accounts for continuing operations     0.3   0.4
Equity-based compensation expense for continuing operations $ 1.0 $ 1.9 $ 2.2 $ 3.6