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Employee Benefit Plans (Contributions to Defined Contribution Plans) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 15, 2019 | Apr. 03, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Contributions to defined contribution plans | $ 17.8 | $ 19.1 | $ 18.8 |  |
Transfer of pension plan asset to life insurance company |  |  |  | $ 73.5 | $ 100.0
UNITED STATES |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage Of Projected Benefit Obligation By Pension Plans | 82.00% |  |  |  |
Plan assets (as a percent) | 75.00% |  |  |  |

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Details
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