Nature of Operations and Accounting Policies - Summary of Property and Equipment from Continuing Operations (Parenthetical) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Offshore Support Vessels, Liftboats
Carrying value of assets held for sale	$ 0.3
Net proceeds from sale of assets	3.2
Gain on sale of assets held for sale	2.7
Transaction costs	0.2
Building
Carrying value of assets held for sale	2.0
Net proceeds from sale of assets	2.4
Gain on sale of assets held for sale	$ 0.4