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Other, Net
 12 Months Ended
Dec. 31, 2020
Other Nonoperating Income (Expense) [Abstract]  
Other, Net Other, Net
Year Ended December 31, (in millions)
202020192018
Interest income$5.5 $7.7 $6.6 
AFUDC equity9.9 8.0 14.2 
Charitable contributions(1)
(1.5)(5.1)(45.3)
Pension and other postretirement non-service cost(2)
9.3 (16.5)18.0 
Sale of emission reduction credits4.6 — — 
Interest rate swap settlement gain(3)
— — 46.2 
Miscellaneous4.3 0.7 3.8 
Total Other, net$32.1 $(5.2)$43.5 
(1) 2018 charitable contributions include $20.7 million related to the Greater Lawrence Incident and $20.0 million of discretionary contributions made to the NiSource Charitable Foundation. See Note 20, "Other Commitments and Contingencies" for additional information on the Greater Lawrence Incident.
(2) See Note 12, "Pension and Other Postretirement Benefits" for additional information.
(3) See Note 10, "Risk Management Activities" for additional information.