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Employee Benefit Plans and Defined Benefit Pension Plans - Components of net periodic pension expense for the business funded defined benefit pension plans (Details)

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Employee Benefit Plans and Defined Benefit Pension Plans - Components of net periodic pension expense for the business funded defined benefit pension plans (Details) - Mafco Worldwide & Merisant - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of net periodic pension expense for the Business' funded defined benefit pension plan          
Service cost   $ (0.2) $ (0.6) $ (0.8) $ (0.8)
Interest cost $ (0.3) (0.3) (1.1) (1.0) (1.0)
Expected return on plan assets (0.4) (0.4) 1.5 1.5 1.5
Amortization of prior service costs     (0.1) (0.1) (0.1)
Settlement/Curtailment expense     (0.3)    
Amortization of net actuarial loss $ 0.1 0.3 (1.1) (1.0) (1.2)
Total net periodic benefit cost   $ (0.4) $ (1.7) $ (1.4) $ (1.6)