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Commitments and Contingencies (Details)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
hearing
Dec. 31, 2015
USD ($)
Dec. 31, 2010
USD ($)
Long-term Purchase Commitment [Line Items]      
Self-insurance accruals $ 25.6 $ 25.5  
Indiana Income Tax      
Long-term Purchase Commitment [Line Items]      
Proposed adjustment excluding interest and penalties     $ 7.3
Number of hearings with IDR | hearing 2    
Minimum | Indiana Income Tax      
Long-term Purchase Commitment [Line Items]      
Year under Examination 2005    
Maximum | Indiana Income Tax      
Long-term Purchase Commitment [Line Items]      
Year under Examination 2007