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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Jun. 30, 2014
Apr. 11, 2014
Healthcare Strategies, Inc., Plan [Member]
Sep. 26, 2012
Healthcare Strategies, Inc., Plan [Member]
plantiff
Feb. 22, 2011
Healthcare Strategies, Inc., Plan [Member]
plantiff
Jun. 30, 2014
Investment purchase commitment
Dec. 31, 2013
Investment purchase commitment
Loss Contingencies [Line Items]            
Off-balance sheet commitment to purchase investments         $ 599.8 $ 466.8
Possible losses in excess of amounts accrued 30.0          
Sponsors of retirement plan alleging violation       2    
Number of plaintiffs     15,000      
Damages sought by plaintiffs   $ 15.0