Annual report pursuant to Section 13 and 15(d)

Long-term Debt - Interest Rate Swaps, Designated as Cash Flow Hedges (Details

v3.10.0.1
Long-term Debt - Interest Rate Swaps, Designated as Cash Flow Hedges (Details - Cash Flow Hedging [Member] - Interest Rate Swap [Member] - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Notional Value $ 61.0 $ 438.0
Fair Value $ 0.3 (0.1)
HASI SYB Loan Agreement 2015-2 A [Member]    
Derivatives, Fair Value [Line Items]    
Hedged Rate 1.52%  
Notional Value $ 0.0 31.0
Fair Value $ 0.0 0.1
HASI SYB Loan Agreement 2015-2 B [Member]    
Derivatives, Fair Value [Line Items]    
Hedged Rate 2.55%  
Notional Value $ 29.0 29.0
Fair Value $ 0.0 (0.2)
HASI SYB Loan Agreement 2015-3 [Member]    
Derivatives, Fair Value [Line Items]    
Hedged Rate 2.34%  
Notional Value $ 0.0 119.0
Fair Value $ 0.0 0.0
HASI SYB Loan Agreement 2016-1 A [Member]    
Derivatives, Fair Value [Line Items]    
Hedged Rate 1.88%  
Notional Value $ 0.0 120.0
Fair Value $ 0.0 1.1
HASI SYB Loan Agreement 2016-1 B [Member]    
Derivatives, Fair Value [Line Items]    
Hedged Rate 2.73%  
Notional Value $ 0.0 107.0
Fair Value $ 0.0 (1.1)
2017 Master Repurchase Agreement [Member]    
Derivatives, Fair Value [Line Items]    
Hedged Rate 2.42%  
Notional Value $ 32.0 32.0
Fair Value $ 0.3 $ 0.0