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8. Other Income and Expenses (Tables)
3 Months Ended
Mar. 31, 2022
Other Income and Expenses [Abstract]  
Schedule of other income (expense), net
Other (income) expense, net includes the following components (in millions):
Three Months Ended
March 31,
 20222021
Interest and investment income$(32.2)$(18.3)
Net realized gains on investments— (0.1)
Other-than-temporary impairment loss on investment— 0.8 
Other (income) expense(0.4)0.2 
Other income, net$(32.6)$(17.4)