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Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenues | $ 456.6 | $ 405.9
Revenue Benchmark [Member] | Geographic Concentration Risk |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenues | 456.6 | 405.9
US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenues | 78.7 | 54.7
SAUDI ARABIA | Revenue Benchmark [Member] | Geographic Concentration Risk |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenues | 83.9 | 53.4
ANGOLA | Revenue Benchmark [Member] | Geographic Concentration Risk |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenues | 61.5 | 70.6
UNITED KINGDOM | Revenue Benchmark [Member] | Geographic Concentration Risk |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenues | 52.5 | 43.4
AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenues | 26.0 | 67.3
Other | Revenue Benchmark [Member] | Geographic Concentration Risk |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenues | $ 154.0 | $ 116.5
Floaters | US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Concentration risk, percentage | 57.00% | 25.00%
Floaters | ANGOLA | Revenue Benchmark [Member] | Geographic Concentration Risk |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Concentration risk, percentage | 82.00% | 86.00%
Floaters | AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Concentration risk, percentage | 59.00% | 94.00%
Jackups | US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Concentration risk, percentage | 16.00% | 45.00%
Jackups | SAUDI ARABIA | Revenue Benchmark [Member] | Geographic Concentration Risk |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Concentration risk, percentage | 53.00% |
Other | SAUDI ARABIA | Revenue Benchmark [Member] | Geographic Concentration Risk |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Concentration risk, percentage | 47.00% |

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