Data as of Dec. 31. Non-calendar fiscal years used for these companies: Deere debt as of Feb. 2, 2020, and earnings as of Nov. 3, 2019; Navistar debt as of Jan. 31, 2020, and earnings as of Oct. 31, 2019; Walgreens Boots Alliance debt as of Nov. 30, 2019, and earnings as of Aug. 31, 2019.