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Employee Benefit Plans and Other Postretirement Benefits - Schedule Of Fair Value Of Pension Plan and Postretirement Healthcare Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Pension Plan Assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | $ 2,209,222 | $ 1,874,618 |
Pension Plan Assets | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 2,192,855 | 1,858,192 |
Pension Plan Assets | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 1,325,197 | 1,149,386 |
Pension Plan Assets | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 867,658 | 708,806 |
Pension Plan Assets | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 16,367 | 16,426 |
Pension Plan Assets | Cash and cash equivalents | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 35,463 | 40,984 |
Pension Plan Assets | Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Pension Plan Assets | Cash and cash equivalents | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 35,463 | 40,984 |
Pension Plan Assets | Equity holdings | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 1,233,337 | 1,076,467 |
Pension Plan Assets | Equity holdings | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 1,209,289 | 1,061,618 |
Pension Plan Assets | Equity holdings | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 24,048 | 14,849 |
Pension Plan Assets | U.S. companies | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 728,892 | 636,308 |
Pension Plan Assets | U.S. companies | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 707,276 | 621,459 |
Pension Plan Assets | U.S. companies | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 21,616 | 14,849 |
Pension Plan Assets | Foreign companies | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 79,707 | 66,143 |
Pension Plan Assets | Foreign companies | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 77,275 | 66,143 |
Pension Plan Assets | Foreign companies | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 2,432 | 0 |
Pension Plan Assets | Harley-Davidson common stock | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 47,365 | 43,455 |
Pension Plan Assets | Harley-Davidson common stock | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 47,365 | 43,455 |
Pension Plan Assets | Harley-Davidson common stock | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Pension Plan Assets | Pooled equity funds | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 377,301 | 330,476 |
Pension Plan Assets | Pooled equity funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 377,301 | 330,476 |
Pension Plan Assets | Pooled equity funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Pension Plan Assets | Other | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 72 | 85 |
Pension Plan Assets | Other | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 72 | 85 |
Pension Plan Assets | Other | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Pension Plan Assets | Fixed-income holdings | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 924,055 | 740,741 |
Pension Plan Assets | Fixed-income holdings | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 115,908 | 87,768 |
Pension Plan Assets | Fixed-income holdings | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 808,147 | 652,973 |
Pension Plan Assets | U.S. Treasuries | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 67,234 | 45,102 |
Pension Plan Assets | U.S. Treasuries | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 67,234 | 45,102 |
Pension Plan Assets | U.S. Treasuries | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Pension Plan Assets | Federal agencies | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 15,434 | 27,811 |
Pension Plan Assets | Federal agencies | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Pension Plan Assets | Federal agencies | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 15,434 | 27,811 |
Pension Plan Assets | Corporate bonds | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 583,475 | 434,070 |
Pension Plan Assets | Corporate bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Pension Plan Assets | Corporate bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 583,475 | 434,070 |
Pension Plan Assets | Pooled fixed income funds | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 142,134 | 140,630 |
Pension Plan Assets | Pooled fixed income funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 48,674 | 42,400 |
Pension Plan Assets | Pooled fixed income funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 93,460 | 98,230 |
Pension Plan Assets | Foreign bonds | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 103,439 | 83,852 |
Pension Plan Assets | Foreign bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 266 |
Pension Plan Assets | Foreign bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 103,439 | 83,586 |
Pension Plan Assets | Municipal bonds | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 12,339 | 9,276 |
Pension Plan Assets | Municipal bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Pension Plan Assets | Municipal bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 12,339 | 9,276 |
Pension Plan Assets | Limited partnership interests | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 4,118 | 5,918 |
Pension Plan Assets | Real estate investment trust | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 12,249 | 10,508 |
Postretirement Health Coverage |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 220,992 | 190,357 | $ 217,537
Postretirement Health Coverage | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 214,354 | 184,860 |
Postretirement Health Coverage | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 193,681 | 166,713 |
Postretirement Health Coverage | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 20,673 | 18,147 |
Postretirement Health Coverage | Cash and cash equivalents | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 2,458 | 5,276 |
Postretirement Health Coverage | Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Postretirement Health Coverage | Cash and cash equivalents | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 2,458 | 5,276 |
Postretirement Health Coverage | Equity holdings | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 151,857 | 124,073 |
Postretirement Health Coverage | Equity holdings | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 151,179 | 124,047 |
Postretirement Health Coverage | Equity holdings | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 678 | 26 |
Postretirement Health Coverage | U.S. companies | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 104,399 | 86,975 |
Postretirement Health Coverage | U.S. companies | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 104,399 | 86,949 |
Postretirement Health Coverage | U.S. companies | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 26 |
Postretirement Health Coverage | Foreign companies | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 22,422 | 16,342 |
Postretirement Health Coverage | Foreign companies | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 21,744 | 16,342 |
Postretirement Health Coverage | Foreign companies | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 678 | 0 |
Postretirement Health Coverage | Pooled equity funds | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 25,029 | 20,747 |
Postretirement Health Coverage | Pooled equity funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 25,029 | 20,747 |
Postretirement Health Coverage | Pooled equity funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Postretirement Health Coverage | Other | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 7 | 9 |
Postretirement Health Coverage | Other | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 7 | 9 |
Postretirement Health Coverage | Other | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Postretirement Health Coverage | Fixed-income holdings | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 60,039 | 55,511 |
Postretirement Health Coverage | Fixed-income holdings | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 42,502 | 42,666 |
Postretirement Health Coverage | Fixed-income holdings | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 17,537 | 12,845 |
Postretirement Health Coverage | U.S. Treasuries | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 5,782 | 8,707 |
Postretirement Health Coverage | U.S. Treasuries | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 5,782 | 8,707 |
Postretirement Health Coverage | U.S. Treasuries | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Postretirement Health Coverage | Federal agencies | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 7,986 | 5,445 |
Postretirement Health Coverage | Federal agencies | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Postretirement Health Coverage | Federal agencies | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 7,986 | 5,445 |
Postretirement Health Coverage | Corporate bonds | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 8,425 | 6,590 |
Postretirement Health Coverage | Corporate bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Postretirement Health Coverage | Corporate bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 8,425 | 6,590 |
Postretirement Health Coverage | Pooled fixed income funds | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 36,720 | 33,959 |
Postretirement Health Coverage | Pooled fixed income funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 36,720 | 33,959 |
Postretirement Health Coverage | Pooled fixed income funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Postretirement Health Coverage | Foreign bonds | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 672 | 538 |
Postretirement Health Coverage | Foreign bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Postretirement Health Coverage | Foreign bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 672 | 538 |
Postretirement Health Coverage | Municipal bonds | Fair Value, Inputs, Level 1 and 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 454 | 272 |
Postretirement Health Coverage | Municipal bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 0 | 0 |
Postretirement Health Coverage | Municipal bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | 454 | 272 |
Postretirement Health Coverage | Real estate investment trust | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit plan assets | $ 6,638 | $ 5,497 |

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