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Other Assets - Other Asset Balances (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Other Assets [Abstract] |  |
Prepaid Expenses | $ 67.0 | $ 67.0
Right of use asset | 39.0 | 57.0
Taxes receivable | 34.0 | 32.0
Reimbursable amounts due from customers | 18.0 | 11.0
Deferred contract costs | 15.0 | 14.0
Marketable Securities | 13.0 | 8.0
Favorable drilling and management services contracts | 10.0 | 10.0
Insurance receivable | 6.4 | 4.0
Other assets | 30.0 | 37.0
Total other assets | 232.0 | $ 240.0
D&O insurance | $ 15.0 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Total other assets | Total other assets

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