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Debt - Revolving Credit Agreement (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Mar. 31, 2018
Dec. 31, 2017
USD ($)
Line of Credit Facility [Line Items]      
Ratio of debt to EBITDA 3.5    
Revolving credit facility      
Line of Credit Facility [Line Items]      
Revolving credit facility     $ 1,500,000,000
Revolving credit agreement $ 284,000,000   $ 150,000,000
Weighted average interest rate of outstanding borrowings   4.42%  
Ratio of debt to EBITDA 3.5