Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Income related to FLA arrangements with Parent	$ 2.6	$ 1.5
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Income related to FLA arrangements with Parent	2.6	1.5
Related parties	28.8	29.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Income related to FLA arrangements with Parent	2.6	1.5
Disaggregation of Revenue [Line Items]
Income related to FLA arrangements with Parent	$ 2.6	1.5
Deficiency revenue		$ 2.4