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Retirement Plans | 12 Months Ended
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Dec. 31, 2020
Retirement Benefits [Abstract] |
Retirement Plans | For purposes of providing employees with retirement benefits, the Company maintains defined contribution retirement plans. Contributions are based on the participants’ eligible compensation. For 2020, 2019 and 2018, the Company expensed $52.0 million, $44.8 million and $40.8 million, respectively, related to these retirement plans.

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