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Equity Method Investment In ARO Narrative (Details) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	May 31, 2017 USD ($)	Jun. 30, 2019 USD ($) jackup rigs	Jun. 30, 2019 USD ($) jackup rigs	Dec. 31, 2018 USD ($)	Oct. 31, 2018 rigs
Schedule of Equity Method Investments [Line Items]
Number of Rigs Sold | rigs					2
Number of Rigs Owned by ARO | jackup		7	7
Shareholder Notes Receivable, Terms			10 years
Due from Joint Ventures, Noncurrent		$ 453.1	$ 453.1	$ 0.0
Contracts Terms On Purchased Rigs			15 years
Contracts On Purchased Rigs, Terms For Renewal And Repricing			3 years
Number of jackups leased by ARO | jackup		9	9
Number of Rigs Undergoing Shipyard Projects | rigs		2	2
Number of Newbuild Jackup Rigs | jackup		20	20
Years for Jackup Rig Orders			10 years
Maximum Contingent Contributions To Joint Venture		$ 1,250.0	$ 1,250.0
Number of Contingent Newbuild Rigs | jackup		10	10
Initial Contract Terms On Rigs Owned			3 years
Contract Terms For NewBuild Rigs			8 years
Minimum Renewal Contract Terms For NewBuild Rigs			8 years
Contract On New Build Rigs, Terms for Repricing			3 years
Number of Jackup Rigs Leased and Operated During Transaction Period | rigs		7	7
Due from Joint Ventures		$ 14.3	$ 14.3
Equity Method Investment Summarized Financial Information Accounts Receivable		63.6	63.6
Equity Method Investment Summarized Financial Information Accounts Payable		2.8	2.8
Equity Method Investment Summarized Financial Information Interest Income		5.1
Equity Method Investment Summarized Financial Information Interest Receivable		$ 11.5	$ 11.5
ARO
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Interest in Joint Venture	$ 25.0
Equity Method Investment, Ownership Percentage		50.00%	50.00%
LIBOR
Schedule of Equity Method Investments [Line Items]
Loans Receivable, Basis Spread on Variable Rate		2.00%	2.00%
ARO
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Summarized Financial Information, Net Income (Loss)		$ 16.8

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