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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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Amount of assets classified as other.

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Description Of The Business And Summary Of Significant Accounting Policies (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) continent country shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs	57
Number of different countries having drilling contracts spanning \| country	14
Number of different continents having drilling contracts \| continent	6
Net foreign currency exchange gains (losses)	$ (6.0)	$ 5.4	$ (2.6)
Short-term Investments	$ 1,442.6	$ 1,180.0
Antidilutive share options excluded from computation of diluted earnings per share \| shares	500,000	800,000	400,000
Three Percent Senior Notes Due Two Thousand Twenty Four [Member] \| Senior Notes [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Debt instrument, interest rate, stated percentage	3.00%
Deferred Mobilization Costs [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Other assets	$ 43.9	$ 77.0
Deferred Regulatory Certification And Compliance Costs [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Other assets	14.9	21.2
Service Life [Member] \| Change in depreciation expense [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Change in Accounting Estimate	$ 20.0
Ultra Deepwater Drillships [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs	8
Semisubmersible Rigs [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs	10
Moored Semisubmersible Rigs [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs	3
Jackup Rigs [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs	38
Construction in Progress [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Number of contract drilling rigs	2
Drilling rigs and equipment [Member] \| Minimum [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	4 years
Drilling rigs and equipment [Member] \| Maximum [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	35 years
Building and Building Improvements [Member] \| Minimum [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Building and Building Improvements [Member] \| Maximum [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Equipment [Member] \| Minimum [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Equipment [Member] \| Maximum [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	6 years
ENSCO DS-9 [Member] \| Sales Revenue, Net [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Gain (Loss) on Contract Termination	$ 185.0
ENSCO 8503 [Member] \| Sales Revenue, Net [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Gain (Loss) on Contract Termination	20.0
ENSCO DS-4 and ENSCO DS-9 [Member] \| Sales Revenue, Net [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Gain (Loss) on Contract Termination		129.0
Mobilization Revenue [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Other Liabilities	62.1	111.8
Capital Reimbursements [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Other Liabilities	$ 165.2	$ 287.2