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Retirement Plans
12 Months Ended
Dec. 31, 2019
Retirement Benefits [Abstract]  
Retirement Plans 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 2019, 2018 and 2017, the Company expensed $44.8 million, $40.8 million and $40.7 million, respectively, related to these retirement plans.