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Summary of Significant Accounting Policies (Narrative) (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
reporting_unit
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2019
USD ($)
Jan. 03, 2018
Jan. 01, 2018
USD ($)
Property, Plant and Equipment [Line Items]                    
Impairment of long-lived assets             $ 4,300,000      
Number of reporting units | reporting_unit         7          
Impairment $ 298,800,000       $ 298,789,000 $ 68,004,000 0      
Goodwill 469,647,000   $ 755,245,000   469,647,000 755,245,000 652,743,000      
Impairment of intangible assets $ 50,200,000 $ 14,500,000     $ 64,700,000 1,100,000 0      
Percent of revenue from goods and services transferred at point in time         97.00%          
Percent of revenue from goods and services transferred over time         3.00%          
U.S. tax reform expense (benefit)     $ 10,100,000   $ (15,604,000) $ 10,138,000 $ 0      
Cumulative effect adjustment to retained earnings                   $ 1,006,000
Subsea Technologies                    
Property, Plant and Equipment [Line Items]                    
Impairment       $ 68,000,000            
Minimum                    
Property, Plant and Equipment [Line Items]                    
Estimated useful life, property and equipment         3 years          
Estimated useful life, intangible assets         3 years          
Minimum | Rental equipment                    
Property, Plant and Equipment [Line Items]                    
Estimated useful life, property and equipment         3 years          
Maximum                    
Property, Plant and Equipment [Line Items]                    
Estimated useful life, property and equipment         30 years          
Estimated useful life, intangible assets         17 years          
Maximum | Rental equipment                    
Property, Plant and Equipment [Line Items]                    
Estimated useful life, property and equipment         10 years          
Retained earnings                    
Property, Plant and Equipment [Line Items]                    
Cumulative effect adjustment to retained earnings                   1,006,000
Accounting Standards Update 2016-16 | Retained earnings                    
Property, Plant and Equipment [Line Items]                    
Cumulative effect adjustment to retained earnings                   $ 1,000,000
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Ashtead Technology                    
Property, Plant and Equipment [Line Items]                    
Equity interest received in sale of business                 40.00%  
Subsequent Event | Scenario, Forecast | Accounting Standards Update 2016-02 | Minimum                    
Property, Plant and Equipment [Line Items]                    
Right of use lease assets               $ 60,000,000    
Lease liability               60,000,000    
Subsequent Event | Scenario, Forecast | Accounting Standards Update 2016-02 | Maximum                    
Property, Plant and Equipment [Line Items]                    
Right of use lease assets               70,000,000    
Lease liability               $ 70,000,000