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Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | $ 551.3 | $ 430.9 | $ 1,541.1 | $ 1,306.4
Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | 551.3 | 430.9 | 1,541.1 | 1,306.4
Geographic Concentration Risk | US Gulf Of Mexico |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | 83.1 | 59.3 | 231.2 | 172.4
Geographic Concentration Risk | SAUDI ARABIA |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | 90.3 | 49.0 | 226.9 | 131.8
Geographic Concentration Risk | AUSTRALIA |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | 51.6 | 75.1 | 189.0 | 207.7
Geographic Concentration Risk | ANGOLA |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | 72.1 | 76.2 | 210.8 | 209.5
Geographic Concentration Risk | UNITED KINGDOM |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | 59.6 | 55.4 | 157.2 | 155.7
Geographic Concentration Risk | Other |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | $ 194.6 | $ 115.9 | $ 526.0 | $ 429.3
Jackups | Geographic Concentration Risk | US Gulf Of Mexico |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 22.00% | 39.00% | 35.00% | 38.00%
Jackups | Geographic Concentration Risk | SAUDI ARABIA |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 58.00% |  | 69.00% |
Floaters | Geographic Concentration Risk | US Gulf Of Mexico |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 52.00% | 35.00% | 40.00% | 36.00%
Floaters | Geographic Concentration Risk | AUSTRALIA |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 99.00% | 87.00% | 95.00% | 94.00%
Floaters | Geographic Concentration Risk | ANGOLA |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 86.00% | 82.00% |  | 87.00%

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