Long-term Employee Benefits - Schedule of Accumulated and Projected Benefit Obligations (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
ABO	$ 604.5	$ 675.1
Plans with PBO in excess of plan assets:
PBO	388.9	493.8
ABO	366.6	464.9
Fair value plan assets	107.8	171.0
Plans with ABO in excess of plan assets:
PBO	387.8	488.8
ABO	365.9	460.7
Fair value plan assets	$ 106.8	$ 166.4

Defined Benefit Plan, Pension Plans with Projected Benefit Obligations in Excess of Plan Assets [Abstract]

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Defined Benefit Plan, Pension Plans with Projected Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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

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

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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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