Commitments and Contingencies (Details 2) - Special Long-Term Retention and Incentive Cash Awards Program - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	May. 31, 2014	Mar. 31, 2014	Dec. 31, 2011
Special Long-Term Retention and Incentive Cash Awards Program
Timeframe for achievement of performance conditions			6 years
Cash bonus expense recognized		$ 9.1
Total cash bonus paid	$ 9.5
Remaining potential cash bonus expense associated with these cash bonus awards after the modification	$ 0.5