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Other Expense, Net (Tables)
 3 Months Ended
Mar. 31, 2022
Other Income And Expenses [Abstract]  
Other Expense, Net

Other expense, net, consisted of the following (in millions of dollars):

 

 

 

Quarter Ended March 31,

 

 

 

2022

 

 

2021

 

Interest income

 

$

—

 

 

$

0.1

 

Net periodic postretirement benefit cost

 

 

(1.4

)

 

 

(0.6

)

Unrealized loss on equity securities

 

 

(0.4

)

 

 

(0.1

)

All other, net

 

 

0.2

 

 

 

0.2

 

Other expense, net

 

$

(1.6

)

 

$

(0.4

)