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Segment Information (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) jackup	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Reportable_segment jackup	Sep. 30, 2018 USD ($)
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Number of operating segments | Reportable_segment			3
Number of jackups leased by ARO | jackup	9		9
EQUITY EARNINGS IN AFFILIATES, NET OF TAX | $	$ (3.7)	$ 0.0	$ (3.1)	$ 0.0

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of jackups leased by ARO

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