Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Tables)

3 Months Ended

9 Months Ended

Sep. 30, 2021

Sep. 30, 2020

Sep. 30, 2021

Sep. 30, 2020

Statement of Comprehensive Income [Abstract]

The tables below display the changes in Accumulated Other Comprehensive Income (Loss) by component for the three months ended September 30, 2021 and 2020.


(Dollars in Millions)	Net Unrealized Gains (Losses) on Other Investments	Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses	Net Unrecognized Postretirement Benefit Costs	Gain (Loss) on Cash Flow Hedges	Total
Balance as of July 1, 2021	594.0	(4.0)	(44.9)	(2.1)	543.0
Other Comprehensive Income (Loss) Before Reclassifications	(56.5)	0.4	—	—	(56.1)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $2.0, $—, $0.1, $(0.1) and $2.0	(7.5)	—	(0.1)	0.1	(7.5)
Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $16.8, $(0.1), $0.1, $(0.1) and $16.7	(64.0)	0.4	(0.1)	0.1	(63.6)
Balance as of September 30, 2021	530.0	(3.6)	(45.0)	(2.0)	479.4


(Dollars in Millions)	Net Unrealized Gains (Losses) on Other Investments	Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses	Net Unrecognized Postretirement Benefit Costs	Gain (Loss) on Cash Flow Hedges	Total
Balance as of July 1, 2020	602.3	(2.9)	(99.5)	(2.6)	497.3
Other Comprehensive Income (Loss) Before Reclassifications	57.0	1.0	0.7	0.1	58.8
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $1.9, $—, $—, $— and $1.9	(7.1)	—	—	—	(7.1)
Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $(13.2), $(0.3), $(0.2), $(0.1) and $(13.8)	49.9	1.0	0.7	0.1	51.7
Balance as of September 30, 2020	652.2	(1.9)	(98.8)	(2.5)	549.0

The tables below display the changes in Accumulated Other Comprehensive Income (Loss) by component for the nine months ended September 30, 2021 and 2020


(Dollars in Millions)	Net Unrealized Gains (Losses) on Other Investments	Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses	Net Unrecognized Postretirement Benefit Costs	Gain (Loss) on Cash Flow Hedges	Total
Balance as of January 1, 2021	730.6	(2.1)	(45.7)	(2.3)	680.5
Other Comprehensive Income (Loss) Before Reclassifications	(172.8)	(1.5)	—	—	(174.3)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $7.4, $—, $0.5, $(0.1) and $7.8	(27.8)	—	0.7	0.3	(26.8)
Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $53.4, $0.4, $0.5, $(0.1) and $54.2	(200.6)	(1.5)	0.7	0.3	(201.1)
Balance as of September 30, 2021	530.0	(3.6)	(45.0)	(2.0)	479.4


(Dollars in Millions)	Net Unrealized Gains (Losses) on Other Investments	Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses	Net Unrecognized Postretirement Benefit Costs	Gain (Loss) on Cash Flow Hedges	Total
Balance as of January 1, 2020	439.4	—	(100.6)	(2.7)	336.1
Other Comprehensive Income (Loss) Before Reclassifications	225.8	(1.9)	1.8	0.2	225.9
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $3.4, $—, $—, $— and $3.4	(13.0)	—	—	—	(13.0)
Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $(56.5), $0.5, $(0.5), $(0.1) and $(56.6)	212.8	(1.9)	1.8	0.2	212.9
Balance as of September 30, 2020	652.2	(1.9)	(98.8)	(2.5)	549.0