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Commitments and Contingencies (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Nov. 30, 2014
Loss Contingencies [Line Items]        
Liability associated with legal and regulatory contingencies   $ 110.0 $ 105.0  
Estimated amount of reasonably possible losses in excess of the recorded liability   $ 150.0    
Unfavorable Regulatory Action        
Loss Contingencies [Line Items]        
Received recommended decision from administrative law judge       $ 6.4
Final order amount company must pay $ 109.0