Financing Arrangements - Equipment Notes (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Debt Instrument [Line Items]
Interest expense, debt		$ 0.2
Equipment Notes \| Secured Debt
Debt Instrument [Line Items]
Interest expense, debt	$ 0.2

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Name:	us-gaap_InterestExpenseDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration