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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 26, 2012
Healthcare Strategies, Inc., Plan [Member]
plantiff
Feb. 22, 2011
Healthcare Strategies, Inc., Plan [Member]
plantiff
Dec. 31, 2013
Investment purchase commitment
Dec. 31, 2012
Investment purchase commitment
Loss Contingencies [Line Items]              
Rent expense $ 4.0 $ 4.9 $ 5.0        
Off-balance sheet commitment to purchase investments           466.8 314.9
Possible losses in excess of amounts accrued $ 30.0            
Sponsors of retirement plan alleging violation         2    
Number of plantiffs       15,000