Quarterly report pursuant to Section 13 or 15(d)

Borrowings Borrowings (6.375% Senior Notes) (Details)

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Borrowings Borrowings (6.375% Senior Notes) (Details) - 6.375% senior unsecured notes due 2026 - USD ($)
Jun. 07, 2018
Sep. 30, 2018
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated (as a percent)   6.375%
Unsecured debt    
Debt Instrument [Line Items]    
Debt instrument aggregate principal amount $ 400,000,000  
Debt instrument, interest rate, stated (as a percent) 6.375% 6.375%
Net proceeds from issuance of senior unsecured notes $ 394,000,000  
Unsecured debt | Change Of Control    
Debt Instrument [Line Items]    
Debt instrument redemption price percent (as a percent) 101.00%  
Unsecured debt | Prior to July 1, 2021, a Redemption of up to 35% of the Principal    
Debt Instrument [Line Items]    
Number of days to closing date of equity offerings 180 days  
Debt instrument redemption price percent (as a percent) 106.375%  
Unsecured debt | Prior to July 1, 2021, a Redemption of up to 35% of the Principal | Maximum    
Debt Instrument [Line Items]    
Redemption principal amount percentage (as a percent) 35.00%  
Unsecured debt | Prior to July 1, 2021, a Redemption of up to 35% of the Principal | Minimum    
Debt Instrument [Line Items]    
Redemption principal remaining amount percentage (as a percent) 65.00%  
Unsecured debt | Prior to July 1, 2021, a Redemption of All or Part of the Principal    
Debt Instrument [Line Items]    
Debt instrument redemption price percent (as a percent) 100.00%  
Unsecured debt | On or After July 1, 2021, but Before July 1, 2022    
Debt Instrument [Line Items]    
Debt instrument redemption price percent (as a percent) 103.188%  
Unsecured debt | On or After July 1, 2022, but Before July 1, 2023    
Debt Instrument [Line Items]    
Debt instrument redemption price percent (as a percent) 102.125%  
Unsecured debt | On or After July 1, 2023, but Before July 1, 2024    
Debt Instrument [Line Items]    
Debt instrument redemption price percent (as a percent) 101.063%  
Unsecured debt | On or After July 1, 2024    
Debt Instrument [Line Items]    
Debt instrument redemption price percent (as a percent) 100.00%