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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Fair Value Measurements    
Net unrealized loss on derivative designated as cash flow hedge $ 27.8 $ 43.9
Loss expected to be reclassified into interest expense within the next 12 months $ 14.6