Impact of COVID-19 - Capacity Reductions Narrative (Details)	1 Months Ended							2 Months Ended
	Oct. 31, 2020	Sep. 30, 2020	Aug. 31, 2020	Jul. 31, 2020	Jun. 30, 2020	May 31, 2020	Apr. 30, 2020	Dec. 31, 2020
Unusual or Infrequent Item, or Both [Line Items]
Capacity reduction in current year compared to prior year		47.10%	36.40%	17.50%	79.00%	93.90%	76.20%
Initial capacity reduction from original plan due to COVID-19					95.00%
Forecast
Unusual or Infrequent Item, or Both [Line Items]
Capacity reduction in current year compared to prior year	36.00%							20.00%