Contracts with Customers - Significant Changes in Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
|
| Revenue from Contract with Customer [Abstract] | ||
| Contract assets, opening balance | $ 20.2 | $ 20.3 |
| Contract liability, beginning balance | 6.4 | 2.6 |
| Performance obligations satisfied during the reporting period | 55.1 | 20.2 |
| Amortization of revenue | (22.1) | (5.9) |
| Unbilled demobilization revenue | 2.2 | |
| Unbilled variable rate revenue | 3.9 | |
| Performance obligations to be satisfied over time | 2.2 | |
| Cash received, excluding amounts recognized as revenue | 139.5 | 9.7 |
| Cash received against the contract asset balance | (20.2) | (20.3) |
| Contract assets, closing balance | 61.2 | 20.2 |
| Contract liability, closing balance | $ 126.0 | $ 6.4 |