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Commitments And Contingencies (Capital Commitments) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Property, Plant and Equipment [Line Items]
Aggregate Contractual Capital Commitments Due In One Year	$ 83.9
Aggregate Contractual Capital Commitments Due In Two Years	165.0
Aggregate Contractual Capital Commitments Due Thereafter	0.0
Total	248.9
ENSCO DS-13 [Member]
Property, Plant and Equipment [Line Items]
Aggregate Contractual Capital Commitments Due In One Year	83.9
Aggregate Contractual Capital Commitments Due In Two Years	0.0
Aggregate Contractual Capital Commitments Due Thereafter	0.0
Total	$ 83.9
Long-term Purchase Commitment, Description	119.1 million
ENSCO DS-14 [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	165.0
Aggregate Contractual Capital Commitments Due Thereafter	0.0
Total	$ 165.0
Long-term Purchase Commitment, Description	218.3 million

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- Definition

Describes the terms of a significant arrangement with a supplier (excluding an unconditional purchase obligation) to acquire goods or services over a period of time beyond one year or the normal operating cycle, if longer, which may include identification of the goods or services to be purchased, pricing, effects on pricing of failing to reach minimum quantities required to be purchased, cancellation rights, and termination provisions.

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Aggregate contractual capital commitments due in one year.

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Aggregate contractual capital commitments due in two years.

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Aggregate Contractual Capital Commitments Due Thereafter

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Total aggregate contractual capital commitments.

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