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Rowan Transaction (Details) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Apr. 11, 2019 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) jackup | Oct. 05, 2018 $ / shares
Business Acquisition [Line Items] |  |  |
Number of Rigs Owned by ARO | jackup |  | 7 |
Number of jackups leased by ARO | jackup |  | 9 |
Number of Newbuild Jackup Rigs | jackup |  | 20 |
Years for Jackup Rig Orders |  | 10 years |
Number of Drillships owned by legacy Rowan | jackup |  | 4 |
Number of Jackup Rigs Owned | jackup |  | 19 |
Rowan Companies [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Acquired Receivables, Gross Contractual Amount |  | $ 201.1 |
Business Combination, Acquisition Related Costs |  | $ 5.9 |
Rowan Companies [Member] | Common Class A [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Share Price | $ / shares |  |  | $ 33.92
Subsequent Event [Member] | Rowan Companies [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned, Per Share | $ / shares | $ 43.67 |  |
Business Combination, Consideration Transferred | $ 1,400.0 |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value | $ 0.0 |  |
Subsequent Event [Member] | Rowan Companies [Member] | Common Class A [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned, Per Share | $ / shares | $ 2.750 |  |
Share Price | $ / shares | $ 15.88 |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 88.3 |  |
Scenario, Forecast [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Acquisition Related Costs | $ 14.2 |  |
Scenario, Forecast [Member] | Rowan Companies [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Consideration Transferred | $ 1,404.6 |  |

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