Revenue From Contracts With Customers Narrative (Details) |
9 Months Ended |
|---|---|
|
Sep. 30, 2018
segment
| |
| Revenue, Initial Application Period Cumulative Effect Transition [Line Items] | |
| Number of business segments | 2 |
| Minimum [Member] | |
| Revenue, Initial Application Period Cumulative Effect Transition [Line Items] | |
| Service Contract, Term | 8 years |
| Maximum [Member] | |
| Revenue, Initial Application Period Cumulative Effect Transition [Line Items] | |
| Service Contract, Term | 10 years |