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Commitments and Contingent Liabilities (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) drilling_unit | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Long-term Purchase Commitment [Line Items] |  |  |
Letters of credit issued | $ 8.6 |  |
IRS proposed unfavorable tax adjustments | 85.0 |  |
Gross unrecognized tax benefits | 98.0 |  | $ 98.0
Tax impact of net unrecognized tax benefits, if reversed | $ 34.0 |  |
Saudi Arabia Joint Venture [Member] |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Period Of Joint Venture Funding Of Drilling Rigs | 10 years |  |
Saudi Arabia Joint Venture [Member] | Maximum [Member] |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Number Of Drilling Rigs To Be Purchased By Joint Venture | drilling_unit | 20 |  |
Contingent Funding Obligation To Equity Method Investment | $ 1,250.0 |  |
Number Of Drilling Rigs To Be Purchased By Each Partner in a 12 month period | drilling_unit | 3 |  |
New Revolving Credit Facility [Member] |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Letters of credit issued | $ 6.9 |  |
Subsequent Event [Member] |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Gross unrecognized tax benefits |  | $ 52.0 |
Increase in Unrecognized Tax Benefits is Reasonably Possible |  | $ 159.0 |

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