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Equity Method Investment in ARO Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($) $ in Millions	4 Months Ended	8 Months Ended	9 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets [Abstract]
Cash and cash equivalents	$ 607.6	$ 608.7		$ 608.7	$ 325.8
Other	90.5	117.8		117.8	386.5
TOTAL ASSETS	2,595.6	2,609.2		2,609.2	12,873.2
Total current assets	1,212.4	1,206.6		1,206.6	1,172.9
Liabilities [Abstract]
Liabilities, Current	390.6	422.0		422.0	426.8
Investment Owned, Balance [Abstract]
EQUITY IN EARNINGS (LOSSES) OF ARO	3.1	6.1			(7.8)	$ (12.6)
Related Party Transactions [Abstract]
Accounts payable		49.1		49.1	30.9
ARO
Related Party Transactions [Abstract]
Lease revenue	21.7	35.4	$ 58.2		52.2
Secondment revenue	1.1	1.5	49.9		21.6
Transition Services revenue	0.0	0.0	17.3		1.3
Total revenue from ARO (1)	22.8	36.9	125.4		75.1
ARO
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]
Equity Method Investment Summarized Fin Information Revenue			410.5	470.6	549.4
Equity Method Investment Summarized Financial Information Contract Drilling			280.2	362.3	388.2
Equity Method Investment Summarized Financial Information Depreciation			40.3	65.2	54.8
Equity Method Investment Summarized Financial Information General And Administrative Expense			27.1	17.8	24.2
Equity Method Investment Summarized Financial Information Operating Income			62.9	25.3	82.2
Equity Method Investment Summarized Financial Information Other Expense, Net			28.6	13.4	26.7
Equity Method Investment Summarized Financial Information Provision For Income Taxes			9.7	7.9	14.2
Equity Method Investment Summarized Fin Information Net Income Loss			24.6	4.0	41.3
Assets [Abstract]
Cash and cash equivalents		270.8		270.8	237.7
Other		135.0		135.0	120.9
Assets, Noncurrent		775.8		775.8	804.0
TOTAL ASSETS		1,181.6		1,181.6	1,162.6
Liabilities [Abstract]
Liabilities, Current		79.9		79.9	70.8
Liabilities, Noncurrent		956.7		956.7	950.8
Liabilities		1,036.6		1,036.6	1,021.6
ARO
Assets [Abstract]
Total current assets		348.1		348.1	585.2
Liabilities [Abstract]
Maximum exposure to loss		299.0		299.0	554.3
Investment Owned, Balance [Abstract]
50% interest in ARO net income (loss)	6.0	(4.0)	12.3		20.7
Amortization of basis differences	(2.9)	10.1	(24.9)		(28.5)
EQUITY IN EARNINGS (LOSSES) OF ARO	$ 3.1	6.1	$ (12.6)		(7.8)
Related Party Transactions [Abstract]
Accounts payable		$ 10.8		$ 10.8	$ 38.3

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