Fair Value Measurements (Quantitative Information) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($) item
Unsecured Debt [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated undiscounted cash outflows | $	$ 0.0
Duration	1 year
Unsecured Debt [Member] | Minimum [Member] | Estimated Probabilities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated probabilities | item	0.05
Unsecured Debt [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated undiscounted cash outflows | $	$ 7.5
Duration	2 years 8 months 12 days
Unsecured Debt [Member] | Weighted Average [Member] | Estimated Probabilities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated probabilities | item	0.18
Unsecured Debt [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated undiscounted cash outflows | $	$ 10.8
Duration	3 years
Unsecured Debt [Member] | Maximum [Member] | Estimated Probabilities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated probabilities | item	0.35
Secured Debt [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated undiscounted cash outflows | $	$ 0.0
Duration	1 year
Secured Debt [Member] | Minimum [Member] | Estimated Probabilities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated probabilities | item	0.05
Secured Debt [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated undiscounted cash outflows | $	$ 59.4
Duration	2 years 8 months 12 days
Secured Debt [Member] | Weighted Average [Member] | Estimated Probabilities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated probabilities | item	0.17
Secured Debt [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated undiscounted cash outflows | $	$ 88.4
Duration	3 years
Secured Debt [Member] | Maximum [Member] | Estimated Probabilities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated probabilities | item	0.35