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Supplemental Cash Flow Information (Narrative) (Details)
Aug. 16, 2018
USD ($)
Loans Payable [Member] | 2026 Notes [Member]  
Cash paid for or (received from):  
Face amount of debt instrument $ 350,000,000
Secured Debt [Member] | Term Loan Facility Maturing In 2025 [Member]  
Cash paid for or (received from):  
Face amount of debt instrument $ 650,000,000