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Fair Value of Financial Instruments - Narrative (Details) - Windstream Commitment
$ in Millions
Oct. 01, 2020
USD ($)
installment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Other commitment | $ $ 490.1
Number of installments | installment 20
Percentage of committed purchase of assets 9.00%