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Equity Method Investment In ARO Narrative (Details) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	May 31, 2017 USD ($)	Sep. 30, 2019 USD ($) jackup	Jun. 30, 2019 USD ($)	Sep. 30, 2019 USD ($) jackup	Dec. 31, 2018 USD ($)	Oct. 31, 2018 rigs
Schedule of Equity Method Investments [Line Items]
Number of Rigs Sold | rigs						2
Long-term notes receivable		$ 452.9		$ 452.9	$ 0.0
Contracts terms on purchased rigs				15 years
Contract re-pricing and renewal				3 years
Number of rigs owned by ARO | jackup		7		7
Number of rigs leased in operation | jackup		8		8
Number of jackups leased by ARO | jackup		9		9
Number of newbuild Jackup Rigs | jackup		20		20
Order period				10 years
Maximum aggregate contribution		$ 1,250.0		$ 1,250.0
Minimum terms for renewal				8 years
Amounts receivable from ARO		40.6		$ 40.6
Accounts payable to ARO		3.0		3.0
Reimbursements included in accounts receivable		14.3		$ 14.3
Interest recognized as interest income		$ 5.8	$ 10.9
ARO
Schedule of Equity Method Investments [Line Items]
Contributions to establish join venture	$ 25.0
Ownership percentage		50.00%		50.00%

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