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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, 2021	Sep. 30, 2020	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Equity Method Investment, Summarized Financial Information [Abstract]
Cash and cash equivalents	$ 620.8		$ 607.6	$ 620.8	$ 620.8		$ 325.8
Other current assets	117.0		90.5	117.0	117.0		386.5
Total assets	2,602.5		2,595.6	2,602.5	2,602.5		12,873.2
Liabilities, Current	426.8		390.6	426.8	426.8		426.8
Investment Owned, Balance [Abstract]
Equity in earnings of ARO	2.6	$ 3.9	3.1	7.4		$ (7.6)
ARO
Equity Method Investment, Summarized Financial Information [Abstract]
Total assets	343.9			343.9	343.9		585.2
Total liabilities	43.3			43.3	43.3		30.9
Maximum exposure to loss	300.6			300.6	300.6		554.3
Investment Owned, Balance [Abstract]
50% interest in ARO net income	(1.3)	12.7	6.0	1.0		17.6
Amortization of basis differences	3.9	(8.8)	(2.9)	6.4		(25.2)
Equity in earnings of ARO	2.6	3.9	$ 3.1	7.4		(7.6)
ARO
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]
Equity Method Investment Summarized Fin Information Revenue	117.7	145.6			365.2	431.9
Contract drilling (exclusive of depreciation)	94.4	99.0			273.4	319.8
Depreciation	16.8	14.8			47.5	41.1
General and administrative	5.4	5.8			12.7	21.2
Operating income	1.1	26.0			31.6	49.8
Other expense, net	3.4	6.7			11.0	20.0
Provision (benefit) for income taxes	0.2	(6.1)			6.6	(5.4)
Equity Method Investment Summarized Fin Information Net Income Loss	(2.5)	$ 25.4			14.0	$ 35.2
Equity Method Investment, Summarized Financial Information [Abstract]
Cash and cash equivalents	309.0			309.0	309.0		237.7
Other current assets	98.0			98.0	98.0		120.9
Non-current assets	776.1			776.1	776.1		804.0
Total assets	1,183.1			1,183.1	1,183.1		1,162.6
Liabilities, Current	77.1			77.1	77.1		70.8
Liabilities, Noncurrent	951.0			951.0	951.0		950.8
Total liabilities	$ 1,028.1			$ 1,028.1	$ 1,028.1		$ 1,021.6

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+ References

No definition available.

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- Definition

Equity Method Investment Summarized Financial Information Provision For Income Taxes

+ References

No definition available.

+ Details

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- Definition

Income (Loss) From Equity Method Investments, Amortization Of Basis Difference

+ References

No definition available.

+ Details

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- Definition

Income (Loss) From Equity Method Investments, Ownership Interest

+ References

No definition available.

+ Details

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- Details

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