v3.26.3
Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES $ 593.6 $ 595.7 $ 1,598.2 $ 1,831.6
Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 593.6 595.7 1,598.2 1,831.6
BRAZIL | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 137.1 144.5 361.2 462.7
ANGOLA | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 103.8 88.0 295.3 198.1
UNITED KINGDOM | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 93.4 99.4 287.5 297.9
Gulf of America | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 72.5 81.3 219.7 273.2
AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 16.3 65.9 48.5 229.1
Other Geographic Areas | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 170.5 116.6 386.0 370.6
Floaters | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 359.3 302.9 846.9 994.7
Floaters | BRAZIL | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 137.1 144.5 361.2 462.7
Floaters | ANGOLA | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 81.1 65.0 225.8 149.5
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 40.9 48.9 122.7 180.0
Floaters | AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 0.0 40.0 0.0 117.6
Floaters | Other Geographic Areas | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 100.2 4.5 137.2 84.9
Jackups | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 188.8 237.1 596.2 688.7
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 22.7 23.0 69.5 48.6
Jackups | UNITED KINGDOM | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 93.4 99.4 287.5 297.9
Jackups | Gulf of America | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 0.0 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 16.3 25.9 48.5 111.5
Jackups | Other Geographic Areas | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 56.4 88.8 189.7 230.7
Other | Revenue Benchmark [Member] | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
OPERATING REVENUES 45.5 55.7 155.1 148.2
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 31.6 32.4 96.0 93.2
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 $ 13.9 $ 23.3 $ 59.1 $ 55.0