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Financial Instruments - Derivatives Not Designated as Hedges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jul. 17, 2019
Level 2
Derivative [Line Items]
Derivative and warrant liabilities	$ 4.4		$ 4.4		$ 7.0
Interest Rate Collar
Derivative [Line Items]
Derivative instruments not designated as hedges, gain (loss)	$ (0.5)	$ (0.6)	$ (2.7)	$ 6.1
Interest Rate Collar \| Not Designated as Hedging Instrument
Derivative [Line Items]
Interest rate collar amount						$ 170.0