Business Combinations and Divestitures - Held for Sale (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Oct. 18, 2018	Jul. 11, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Liabilities, Current	$ 49.0	$ 49.0				$ 0.0
Asset Impairment Charges	50.0	50.0
Impairment of Long-Lived Assets to be Disposed of		111.0	$ 0.0
Assets Held for Sale	618.0	618.0				359.0
Property, plant and equipment	2,157.0	2,157.0				$ 2,708.0
Land Drilling Rigs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of Long-Lived Assets to be Disposed of	18.0
Discontinued Operations, Held-for-sale | Land Drilling Rigs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets	484.0	484.0
Disposal Group, Including Discontinued Operation, Goodwill	60.0	60.0
Inventory	$ 74.0	$ 74.0
Discontinued Operations, Disposed of by Sale | Land Drilling Rigs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration					$ 287.5
Escrow Deposit Liability					$ 43.0
Subsequent Event | Discontinued Operations, Disposed of by Sale | Laboratory Service Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration				$ 205.0