Annual report pursuant to Section 13 and 15(d)

Acquisition (Details)

v2.4.0.8
Acquisition (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 120 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2010
Nov. 03, 2010
Dec. 31, 2013
Contingent Consideration Type [Domain]
Dec. 31, 2012
Contingent Consideration Type [Domain]
Nov. 01, 2020
Weighted Average [Member]
Business Acquisition [Line Items]                
Business Acquisition, Percentage of Voting Interests Acquired         100.00%      
Business Acquisition, Cost of Acquired Entity, Purchase Price         $ 23.9      
Business Acquisition, Preacquisition Contingency, Amount         1.3      
Business Acquisition, Contingent Consideration, Potential Cash Payment   6.0 3.4   30.0      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 12.5 12.5 5.0     2.5 2.5  
Business Acquisition, Purchase Price Allocation, Goodwill Amount         18.9      
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets       8.4        
Finite-Lived Intangible Asset, Useful Life               7 years 4 months 24 days
Business Acquisition, Purchase Price Allocation, Current Liabilities, Deferred Revenue         4.0      
Business Acquisition, Contingent Consideration, at Fair Value   0.5     1.6      
Business Acquisition, Purchase Price Allocation, Liabilities Assumed         0.9      
Goodwill, Impairment Loss 16.4              
Impairment of Intangible Assets (Excluding Goodwill) $ 6.4