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Accumulated Other Comprehensive Loss (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

Accumulated other comprehensive loss at the balance sheet dates is comprised of the following:

			Pension Plan Adjustments						Other Postretirement Employee Benefit Plan Adjustments						Total
Balance at December 31, 2021			$	(42.8)					$	0.3					$	(42.6)
Other comprehensive income (loss) before reclassifications			(8.3)						13.0						4.7
Amounts reclassified from accumulated other comprehensive loss			4.7						—						4.7
Other comprehensive income (loss), net of tax			(3.7)						13.0						9.3
Balance at December 31, 2022			(46.5)						13.3						(33.3)
Other comprehensive income (loss) before reclassifications			4.5						(1.7)						2.8
Amounts reclassified from accumulated other comprehensive loss			0.1						(0.3)						(0.2)
Other comprehensive income (loss), net of tax			4.6						(2.0)						2.6
Balance at December 31, 2023			$	(42.0)					$	11.3					$	(30.7)

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- Definition

Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss).

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