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Net Periodic Cost (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |
Curtailment and settlement | $ (0.6) | $ 0.1 | $ (0.0)
Domestic Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |
Service cost | 0.0 | 0.0 | 0.0
Interest cost | 2.9 | 3.7 | 4.8
Expected return on plan assets | (5.6) | (5.7) | (5.9)
Curtailment and settlement | 1.5 | 0.0 | 0.0
Amortization of: |  |  |
Prior service cost (credit) | 0.0 | 0.0 | 0.0
Net actuarial losses | 1.7 | 1.7 | 1.9
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ 0.5 | $ (0.3) | $ 0.8
Discount rate | 2.60% | 3.35% | 4.35%
Expected return on plan assets | 5.75% | 6.00% | 7.00%
Interest crediting rate | 5.10% | 5.10% | 5.10%
Discount rate | 2.95% | 2.60% | 3.35%
Interest crediting rate | 5.10% | 5.10% | 5.10%
Foreign Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |
Service cost | $ 4.5 | $ 4.9 | $ 4.8
Interest cost | 8.0 | 9.4 | 12.4
Expected return on plan assets | (20.8) | (18.8) | (17.4)
Curtailment and settlement | (0.9) | (0.1) | 0.0
Amortization of: |  |  |
Prior service cost (credit) | 0.1 | 0.1 | 0.1
Net actuarial losses | 6.7 | 5.4 | 4.8
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ (2.4) | $ 0.9 | $ 4.7
Discount rate | 1.35% | 1.84% | 2.61%
Rate of compensation increase | 2.47% | 2.51% | 2.58%
Expected return on plan assets | 4.47% | 4.70% | 4.76%
Interest crediting rate | 1.50% | 1.37% | 1.44%
Discount rate | 1.86% | 1.35% | 1.84%
Rate of compensation increase | 2.65% | 2.47% | 2.51%
Interest crediting rate | 1.50% | 1.50% | 1.37%
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |
Service cost | $ 0.0 | $ 0.0 | $ 0.0
Interest cost | 0.7 | 0.8 | 1.2
Expected return on plan assets | 0.0 | 0.0 | 0.0
Curtailment and settlement | 0.0 | 0.0 | 0.0
Amortization of: |  |  |
Prior service cost (credit) | 0.0 | 0.0 | (0.2)
Net actuarial losses | 0.9 | 0.2 | 0.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ 1.6 | $ 1.0 | $ 1.1
Discount rate | 2.50% | 3.25% | 4.30%
Discount rate | 2.90% | 2.50% | 3.25%
Health care cost trend rate assumed for next year | 6.50% | 6.75% | 7.00%
Year ultimate rate is reached | 2028 | 2028 | 2028
Ultimate rate | 5.00% | 5.00% | 5.00%

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