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Postretirement and Other Benefits - PBO and ABO in Excess of Fair Value of Plan Assets (Details) - Pension Benefits - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
PBO	$ 125.1	$ 119.9
ABO	125.1	119.9
Fair value of plan assets	134.4	125.8	$ 113.1
France
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
PBO	35.8	31.9
ABO	35.8	31.9
Fair value of plan assets	$ 0.8	$ 1.1	$ 2.1

X

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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- Definition

Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets.

+ References

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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