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Commitments And Contingencies (Capital Commitments) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |
Aggregate Contractual Capital Commitments Due In One Year |  | $ 0.0
Aggregate Contractual Capital Commitments Due In Two Years |  | 83.9
Aggregate Contractual Capital Commitments Due In Three Years |  | 165.0
Aggregate Contractual Capital Commitments Due Thereafter |  | 0.0
Total |  | 248.9
Holding Costs |  | 23.0
Milestone Payment |  | 313.3
ENSCO DS-13 [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Aggregate Contractual Capital Commitments Due In One Year |  | 0.0
Aggregate Contractual Capital Commitments Due In Two Years |  | 83.9
Aggregate Contractual Capital Commitments Due In Three Years |  | 0.0
Aggregate Contractual Capital Commitments Due Thereafter |  | 0.0
Total |  | 83.9
ENSCO DS-14 [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Aggregate Contractual Capital Commitments Due In Two Years |  | 0.0
Aggregate Contractual Capital Commitments Due In Three Years |  | 165.0
Aggregate Contractual Capital Commitments Due Thereafter |  | 0.0
Total |  | $ 165.0
Forecast [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Projected Capital Expenditures | $ 160.0 |

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