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Revenue Related to Contracts With Customers (Details)
6 Months Ended
Jun. 30, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01  
Disaggregation of Revenue [Line Items]  
Performance obligations expected to be satisfied, percentage 44.00%
Performance obligations expected to be satisfied, expected timing 2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01  
Disaggregation of Revenue [Line Items]  
Performance obligations expected to be satisfied, percentage 62.00%
Performance obligations expected to be satisfied, expected timing 5 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01  
Disaggregation of Revenue [Line Items]  
Performance obligations expected to be satisfied, percentage 89.00%
Performance obligations expected to be satisfied, expected timing 15 years