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Other–Net, (Income) Expense
 6 Months Ended
Jun. 30, 2020
Nonoperating Income (Expense) [Abstract]  
Other–Net, (Income) Expense Other–Net, (Income) Expense
Other–net, (income) expense consisted of the following:
Three Months Ended
June 30,		Six Months Ended
June 30,
 2020201920202019
Interest expense$88.3  $110.9  $180.8  $197.4  
Interest income(7.1) (19.4) (21.4) (50.0) 
Retirement benefit plans(35.9) (49.8) (80.5) (105.7) 
Other income(492.2) (9.3) (614.9) (95.3) 
Other–net, (income) expense$(446.9) $32.4  $(536.0) $(53.6) 
For the three and six months ended June 30, 2020, other income is primarily related to net gains on investments (Note 7).