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Shareholders' equity and share-based payments - SunPower Plans (Details)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
plan
EquityInstruments
shares
Dec. 31, 2018
USD ($)
EquityInstruments
shares
Dec. 31, 2017
USD ($)
EquityInstruments
shares
Dec. 31, 2016
Dec. 31, 2015
SunPower Plans          
Share-based payments          
Number of stock incentive plans | plan 1        
Number of shares withheld to satisfy employees' tax obligations | shares 0.8 0.7 0.6    
2015 Plan (SunPower)          
Share-based payments          
Maximum annual increase of awards | shares 6.0        
Annual automatic increase in awards, as percent of the outstanding shares of the preceding fiscal year       2.00% 3.00%
Shares available for grant | shares 12.1        
2015 Plan (SunPower) | Low          
Share-based payments          
Vesting period 3 years        
2015 Plan (SunPower) | High          
Share-based payments          
Vesting period 4 years        
Stock options (SunPower)          
Share-based payments          
Options remaining outstanding | EquityInstruments 0        
Number of share options exercisable in share-based payment arrangement | EquityInstruments 0        
Intrinsic value of options exercised | $ $ 0.0 $ 0.0 $ 1.7    
Granted (in shares) | EquityInstruments 0 0 0    
Stock options (SunPower) | High          
Share-based payments          
Expiry period 10 years