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Other–Net, (Income) Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Nonoperating Income (Expense) [Abstract]    
Interest expense $ 84.9 $ 87.8
Interest income (7.0) (5.5)
Net investment (gains) losses on equity securities (Note 6) 425.4 (301.5)
Retirement benefit plans (93.3) (73.4)
Other (income) expense (59.3) (28.5)
Other–net, (income) expense $ 350.7 $ (321.1)