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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, 2019	Dec. 31, 2018	Dec. 31, 2017
United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
PBO	$ 119.9	$ 112.3
ABO	119.9	112.3
Fair value of plan assets	125.8	113.1	$ 128.7
France
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
PBO	31.9	29.5
ABO	31.9	24.9
Fair value of plan assets	$ 1.1	$ 2.1	$ 3.2

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.

+ References

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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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