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Employee Defined Benefit Retirement Plans (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Jul. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Retirement plan liability |  |  |  | $ 7.9
Net periodic benefit cost | $ 0.1 | $ 0.1 |  |
Other Long-term Investments |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Defined benefit obligation | $ 4.5 |  | $ 4.5 |

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