Business Combinations and Divestitures - Divestitures (Details) - Discontinued Operations, Disposed of by Sale - Land Drilling Rigs - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration transferred	$ 72.0		$ 287.5
Loss on disposition of business	$ 6.0
Divestitures, assets		$ 66.0

Amount classified as assets attributable to disposal group held for sale or disposed of.

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