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Employee Benefit Plans and Defined Benefit Pension Planss - Contribution (Details)

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Employee Benefit Plans and Defined Benefit Pension Planss - Contribution (Details) - Mafco Worldwide & Merisant - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Net periodic pension cost   $ 0.4   $ 1.7 $ 1.4 $ 1.6
Plan assets       21.4 19.8  
State-sponsored defined benefit plans            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Net periodic pension cost $ 0.1     0.1    
Total net liabilities on defined benefit plans 2.8     2.8    
Pension benefit obligation 5.6     5.6    
Plan assets $ 2.8     2.8    
Unfunded plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Net periodic pension cost       0.6 0.7 $ 0.5
Total net liabilities on defined benefit plans       0.4 0.3  
Pension benefit obligation       8.4 $ 7.4  
Supplemental benefit plan | Unfunded plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Net periodic pension cost       $ 0.6    
Supplemental benefit plan | Unfunded plan | Forecast            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Net periodic pension cost     $ 0.9