v3.26.1
Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES $ 539.2 $ 615.2 $ 1,004.6 $ 1,235.9
Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 539.2 615.2 1,004.6 1,235.9
BRAZIL | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 138.3 154.2 224.1 318.2
ANGOLA | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 97.6 63.6 191.5 110.1
UNITED KINGDOM | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 93.6 97.8 194.1 198.5
Gulf of America | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 74.8 98.5 147.2 191.9
AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 16.0 78.1 32.2 163.2
Other Geographic Areas | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 118.9 123.0 215.5 254.0
Floaters | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 290.0 326.9 487.6 691.8
Floaters | BRAZIL | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 138.3 154.2 224.1 318.2
Floaters | ANGOLA | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 74.1 42.3 144.7 84.5
Floaters | UNITED KINGDOM | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 0.0 0.0 0.0 0.0
Floaters | Gulf of America | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 40.6 65.7 81.8 131.1
Floaters | AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 0.0 38.0 0.0 77.6
Floaters | Other Geographic Areas | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 37.0 26.7 37.0 80.4
Jackups | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 197.2 238.0 407.4 451.6
Jackups | BRAZIL | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 0.0 0.0 0.0 0.0
Jackups | ANGOLA | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 23.5 21.3 46.8 25.6
Jackups | UNITED KINGDOM | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 93.6 97.8 194.1 198.5
Jackups | Gulf of America | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 1.0 0.0 1.0 0.0
Jackups | AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 16.0 40.1 32.2 85.6
Jackups | Other Geographic Areas | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 63.1 78.8 133.3 141.9
Other | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 52.0 50.3 109.6 92.5
Other | BRAZIL | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 0.0 0.0 0.0 0.0
Other | ANGOLA | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 0.0 0.0 0.0 0.0
Other | UNITED KINGDOM | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 0.0 0.0 0.0 0.0
Other | Gulf of America | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 33.2 32.8 64.4 60.8
Other | AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 0.0 0.0 0.0 0.0
Other | Other Geographic Areas | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES $ 18.8 $ 17.5 $ 45.2 $ 31.7