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Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($) $ in Millions	3 Months Ended		4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Equity Method Investment, Summarized Financial Information [Abstract]
Cash and cash equivalents	$ 406.0				$ 406.0		$ 608.7
Other current assets	162.9				162.9		117.8
Total assets	2,821.2				2,821.2		2,609.2
Liabilities, Current	519.1				519.1		422.0
Investment Owned, Balance [Abstract]
Equity in earnings of ARO	2.9	$ 2.6	$ 3.1	$ 7.4	15.9
ARO
Investment Owned, Balance [Abstract]
50% interest in ARO net income	(0.7)	(1.3)	6.0	1.0	5.0
Amortization of basis differences	3.6	3.9	(2.9)	6.4	10.9
Equity in earnings of ARO	2.9	2.6	$ 3.1	$ 7.4	15.9
ARO
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]
Equity Method Investment Summarized Fin Information Revenue	111.4	117.7			339.1	$ 365.2
Contract drilling (exclusive of depreciation)	90.0	94.4			256.3	273.4
Depreciation	15.4	16.8			47.3	47.5
General and administrative	4.7	5.4			13.1	12.7
Operating income	1.3	1.1			22.4	31.6
Other expense, net	2.7	3.4			9.3	11.0
Provision (benefit) for income taxes	(0.1)	0.2			3.1	6.6
Equity Method Investment Summarized Fin Information Net Income Loss	(1.3)	$ (2.5)			10.0	$ 14.0
Equity Method Investment, Summarized Financial Information [Abstract]
Cash and cash equivalents	173.5				173.5		270.8
Other current assets	145.6				145.6		135.0
Non-current assets	800.9				800.9		775.8
Total assets	1,120.0				1,120.0		1,181.6
Liabilities, Current	87.3				87.3		79.9
Liabilities, Noncurrent	879.5				879.5		956.7
Total liabilities	966.8				966.8		1,036.6
Total assets	366.9				366.9		348.1
Less: total liabilities	55.4				55.4		49.1
Maximum exposure to loss	$ 311.5				$ 311.5		$ 299.0

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