Post Employment Plans - Changes in Fair Value of Level 3 Pension Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning	$ 165.4
Fair value of plan assets at end of period	189.1	$ 165.4
Level 3
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning	56.1	49.9
Actual return on plan assets	1.9	8.1
Purchases, sales and settlements, net	1.2	(0.5)
Foreign exchange	5.0	(1.4)
Fair value of plan assets at end of period	$ 64.2	$ 56.1

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

+ References

+ Details

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- Definition

Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment.

+ References

+ Details

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- Details

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