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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Related party transactions      
Lease expense $ 2.8 $ 2.7 $ 2.4
Expenses incurred with related party $ 3.2 3.2 2.5
O&G [Member]      
Related party transactions      
Ownership percentage in joint venture 30.00%    
Alliant [Member]      
Related party transactions      
Insurance expense $ 8.9 9.8 $ 14.2
Owed to related party $ 5.2 $ 7.5