Post Employment Benefit Plans (Details) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Sep. 11, 2014 |
Dec. 31, 2017
USD ($)
plan
|
Dec. 31, 2016
USD ($)
|
|
| Retirement Benefits [Abstract] | |||
| Defined contribution plan, number of plans | plan | 1 | ||
| Portion of contributions charged to income | $ 3.0 | $ 2.7 | |
| Benefits plan vesting percentage | 100.00% | ||
| Benefit contributions accrued | $ 0.1 | ||