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8. Other Income and Expenses
9 Months Ended
Sep. 30, 2021
Other Income and Expenses [Abstract]  
Other Income and Other Expense Disclosure .    OTHER INCOME AND EXPENSE, NET
Other (income) expense, net includes the following components (in millions):
Three Months EndedNine Months Ended
September 30,September 30,
 2021202020212020
Interest and investment income$0.3 $(1.8)$(18.7)$(14.6)
Net realized gains on investments— — (0.1)(0.6)
Other-than-temporary impairment loss on investment— — 0.8 4.6 
Gain on divestiture of a division— — — (11.7)
Other expense0.3 0.8 1.3 0.8 
Other (income) expense, net$0.6 $(1.0)$(16.7)$(21.5)