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Equity Method Investment in ARO Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investment Owned, Balance [Abstract]
Equity in earnings of ARO	$ (9.5)	$ (3.7)	$ 0.6	$ 0.0	$ (12.6)	$ 0.0	$ 0.0
Notes Receivable [Abstract]
Notes Receivable, Related Parties	452.9				452.9
October 2027
Notes Receivable [Abstract]
Notes Receivable, Related Parties	275.2				275.2
October 2028
Notes Receivable [Abstract]
Notes Receivable, Related Parties	177.7				177.7
ARO
Related Party Transactions [Abstract]
Lease revenue					58.2
Secondment revenue					49.9
Transition Services revenue					17.3
Total revenue from ARO (1)					125.4
ARO
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]
Revenues					410.5
Contract drilling (exclusive of depreciation)					280.2
Depreciation					40.3
General and administrative					27.1
Operating income					62.9
Other expense, net					28.6
Provision for income taxes					9.7
Net income					24.6
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]
Current assets	407.2				407.2
Non-current assets	874.8				874.8
Total assets	1,282.0				1,282.0
Current liabilities	183.2				183.2
Non-current liabilities	1,015.5				1,015.5
Total liabilities	1,198.7				1,198.7
ARO
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]
Total assets	623.5				623.5
Total liabilities	0.7				0.7
Maximum exposure to loss	$ 622.8				622.8
Investment Owned, Balance [Abstract]
50% interest in ARO net income					12.3
Amortization of basis differences					(24.9)
Equity in earnings of ARO					$ (12.6)

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No definition available.

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- Definition

Secondment Revenue, Related Party

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No definition available.

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- Definition

Transition Services Revenue, Related Party

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No definition available.

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