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Debt (Narrative) (Details) - USD ($)
1 Months Ended 9 Months Ended
Nov. 01, 2019
Sep. 30, 2019
Sep. 30, 2019
Term loans      
Debt Instrument [Line Items]      
Repayments of debt   $ 165,000,000 $ 38,000,000
Loan amount   200,000,000 $ 200,000,000
Loss on redemption of debt   $ 1,000,000  
Term loans | Subsequent Event      
Debt Instrument [Line Items]      
Loan amount $ 400,000,000    
Debt term 5 years    
Line of credit | Revolving credit facility | Subsequent Event      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 500,000,000    
Notes due May 2022 | Notes due      
Debt Instrument [Line Items]      
Increase in interest rate     0.25%
Notes due September 2020 | Notes due      
Debt Instrument [Line Items]      
Increase in interest rate     0.25%
Notes due October 2021 | Notes due      
Debt Instrument [Line Items]      
Increase in interest rate     0.25%
Notes due April 2023 | Notes due      
Debt Instrument [Line Items]      
Increase in interest rate     0.25%
Term loan due November 2019 | Term loans | Subsequent Event      
Debt Instrument [Line Items]      
Repayments of debt 150,000,000    
Term loan due December 2020 | Term loans | Subsequent Event      
Debt Instrument [Line Items]      
Repayments of debt $ 300,000,000