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Income Taxes - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 30, 2016
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Loss Carryforwards            
Provisional net charge due to new tax regulations   $ 11,800,000   $ 11,800,000    
Additional charge to revalue deferred tax assets     $ 700,000      
Operating loss carryforwards, domestic     9,500,000      
Operating loss carryforwards, state and local     588,200,000      
Operating loss carryforwards, foreign     270,500,000      
Tax credit carryforwards     42,600,000      
Carryforwards expiring in 2019     9,400,000      
Tax credit carryforwards expiring between 2019 and 2036     634,600,000      
Increase (decrease) in valuation allowance     (21,600,000) 35,100,000    
Undistributed earnings of foreign subsidiaries     129,300,000      
Unrecognized tax benefit   31,300,000 20,300,000 31,300,000 $ 37,900,000 $ 48,800,000
Net unrecognized tax benefits   20,600,000 13,800,000 20,600,000 25,200,000  
Unrecognized tax benefits that would impact the effective tax rate if recognized     10,100,000      
Gross accrued interest   3,900,000 3,800,000 3,900,000 3,700,000  
Net accrued interest   2,500,000 2,900,000 2,500,000 2,400,000  
Gross interest income included in income tax (provision) benefit     100,000 (200,000) 1,800,000  
Penalties excluded   $ 0 0 0 0  
Excess tax benefits from stock-based compensation awards vested during the year     2,200,000      
Income tax benefit for worthless stock deduction     33,000,000 77,600,000    
Tax benefit related to various audit settlements, statute expirations, and other adjustments     7,000,000 4,900,000    
Gain on sale of dry cooling business     0 0 18,400,000  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Dry Cooling Business            
Operating Loss Carryforwards            
Income taxes on gain from sale of business         (300,000)  
Gain on sale of dry cooling business $ 18,400,000       18,400,000  
Maximum            
Operating Loss Carryforwards            
Reasonably possible amount that unrecognized tax benefits could decrease within next 12 months, low end of range     $ 4,000,000      
Foreign Jurisdictions            
Operating Loss Carryforwards            
Foreign losses generated for which no tax benefit was recognized       $ 68,200,000 13,700,000  
Accounting Standards Update 2016-09            
Operating Loss Carryforwards            
Tax benefit related to various audit settlements, statute expirations, and other adjustments         $ 2,400,000