Quarter Ended September 30,

Nine Months Ended September 30,

2023

2022

2023

2022

Defined Benefit Plans:

Beginning balance

$

(1.1

)

$

(19.6

)

$

2.8

$

(21.4

)

Actuarial loss arising during the period

—

—

(0.6

)

—

Less: income tax benefit

—

—

0.1

—

Net actuarial loss arising during the period

—

—

(0.5

)

—

Prior service cost arising during the period

—

—

(6.6

)

—

Less: income tax benefit

—

—

1.6

—

Net prior service cost arising during the period

—

—

(5.0

)

—

Amortization of net actuarial gain1

(0.3

)

—

(0.9

)

—

Amortization of prior service cost1

1.4

1.2

4.0

3.7

Less: income tax expense2

(0.3

)

(0.2

)

(0.7

)

(0.9

)

Net amortization reclassified from AOCI to Net income (loss)

0.8

1.0

2.4

2.8

Other comprehensive income (loss), net of tax

0.8

1.0

(3.1

)

2.8

Ending balance

$

(0.3

)

$

(18.6

)

$

(0.3

)

$

(18.6

)

Cash Flow Hedges:

Beginning balance

$

(4.1

)

$

(1.7

)

$

0.4

$

17.7

Unrealized gain (loss) on cash flow hedges

2.4

(9.8

)

(9.2

)

(18.2

)

Less: income tax (expense) benefit

(0.6

)

2.2

2.1

4.2

Net unrealized gain (loss) on cash flow hedges

1.8

(7.6

)

(7.1

)

(14.0

)

Reclassification of unrealized loss (gain) upon settlement of cash flow hedges

4.5

8.1

10.2

(8.9

)

Less: income tax (expense) benefit2

(1.1

)

(1.9

)

(2.4

)

2.1

Net loss (gain) reclassified from AOCI to Net income (loss)

3.4

6.2

7.8

(6.8

)

Other comprehensive income (loss), net of tax

5.2

(1.4

)

0.7

(20.8

)

Ending balance3

$

1.1

$

(3.1

)

$

1.1

$

(3.1

)

Total AOCI ending balance

$

0.8

$

(21.7

)

$

0.8

$

(21.7

)