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Details of Selected Balance Sheet Accounts - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Details of Selected Balance Sheet Accounts [Abstract]      
Increase (decrease) in contract with customer, asset $ (20.0)    
Increases due to revenue recognized during the period 17.7    
Contract with customer, asset, reclassified to receivable 38.0    
Increase (decrease) in contract with customer, liability (4.1)    
Contract with customer, liability, revenue recognized 11.1    
Increases due to billings, excluding amounts recognized as revenue during the period 7.4    
Segment Reporting Information [Line Items]      
Depreciation 97.2 $ 99.0 $ 110.5
Offshore/Manufactured Products [Member]      
Segment Reporting Information [Line Items]      
Gain on insurance settlement $ 3.8