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Income Taxes, Foreign Income Tax (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
country
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Income Tax Foreign Tax Jurisdiction [Line Items]      
U.S. federal income tax rate 21.00% 35.00% 35.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | $ $ 47.0 $ 125.9 $ 0.0
Number of countries in which the company has operations that constitute an income tax presence | country 91    
Threshold for foreign taxing jurisdiction to be considered very low rate (in hundredths) 25.00%    
HONG KONG [Member]      
Income Tax Foreign Tax Jurisdiction [Line Items]      
Foreign tax rate considered to be very low tax rates 16.50%    
SINGAPORE [Member]      
Income Tax Foreign Tax Jurisdiction [Line Items]      
Foreign tax rate considered to be very low tax rates 17.00%    
UNITED KINGDOM [Member]      
Income Tax Foreign Tax Jurisdiction [Line Items]      
Foreign tax rate considered to be very low tax rates 19.00%    
SAUDI ARABIA      
Income Tax Foreign Tax Jurisdiction [Line Items]      
Foreign tax rate considered to be very low tax rates 20.00%    
Other Foreign Tax Authorities [Member]      
Income Tax Foreign Tax Jurisdiction [Line Items]      
Foreign tax rate considered to be very low tax rates 25.00%