Summary Of Major Accounting Policies - Property, Plant and Equipment and Long-Lived Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Construction in Progress, Gross	$ 55.0	$ 58.0
Remotely Operated Vehicles [Member]
Property, Plant and Equipment [Line Items]
Operating Leases, Operating Lease Term	8 years
Marine Services Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Operating Leases, Operating Lease Term	25 years
Marine Services Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Operating Leases, Operating Lease Term	3 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Operating Leases, Operating Lease Term	25 years
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Operating Leases, Operating Lease Term	3 years