Accumulated Other Comprehensive Loss (Notes)

9 Months Ended

Sep. 30, 2024

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss, net of tax, is comprised of the following:

	Pension Plan Adjustments		Other Post Retirement Employee Benefit Plan Adjustments		Total
Balance at December 31, 2022	$	(46.5)	$	13.3	$	(33.3)
Amounts reclassified from accumulated other comprehensive loss	—		(0.3)		(0.2)
Balance at September 30, 2023	$	(46.5)	$	13.0	$	(33.5)
Balance at December 31, 2023	$	(42.0)	$	11.3	$	(30.7)
Amounts reclassified from accumulated other comprehensive loss	0.1		(0.2)		(0.1)
Balance at September 30, 2024	$	(41.9)	$	11.1	$	(30.8)