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Debt Obligations - Senior Notes (Details) - USD ($)
Oct. 20, 2017
Mar. 31, 2018
Apr. 01, 2017
Debt Instrument [Line Items]      
Long-term debt   $ 874,400,000 $ 133,100,000
4.000% Senior Notes due 2024 | 4.00% Senior Notes, Maturity 2024      
Debt Instrument [Line Items]      
Aggregate principal amount $ 450,000,000.0    
Stated interest rate 4.00%    
Debt issuance price as percentage of principal amount 99.508%    
Long-term debt   $ 444,500,000  
4.000% Senior Notes due 2024 | 4.00% Senior Notes, Maturity 2024 | Anytime      
Debt Instrument [Line Items]      
Debt redemption price as a percentage 100.00%    
4.000% Senior Notes due 2024 | 4.00% Senior Notes, Maturity 2024 | Anytime | Treasury Rate      
Debt Instrument [Line Items]      
Make whole redemption, basis spread on variable rate 0.30%    
4.000% Senior Notes due 2024 | 4.00% Senior Notes, Maturity 2024 | Change of control event      
Debt Instrument [Line Items]      
Debt redemption price as a percentage 101.00%