Stockholder's Equity (Tables)

9 Months Ended

Sep. 30, 2026

Equity [Abstract]

Changes in Accumulated Other Comprehensive Loss


						Defined Benefit						Commodity						Interest Rate
						Pension and						Contract						Swap
						Postretirement						Cash Flow						Cash Flow
						Plan Items						Hedges						Hedges						Total
(in millions)
As of December 31, 2025						$	(1.7)					$	(0.5)					$	(0.5)					$	(2.7)
Other comprehensive income (loss) before reclassifications						—						1.7						1.1						2.8
Amounts reclassified from accumulated other comprehensive loss						—						(0.2)						0.1						(0.1)
Net current-period other comprehensive income (loss)						—						1.5						1.2						2.7

As of September 30, 2026						$	(1.7)					$	1.0					$	0.7					$	—



As of December 31, 2024						$	(2.1)					$	0.4					$	—					$	(1.7)
Other comprehensive income (loss) before reclassifications						—						—						(0.8)						(0.8)
Amounts reclassified from accumulated other comprehensive loss						—						(0.5)						(0.2)						(0.7)
Net current-period other comprehensive income (loss)						—						(0.5)						(1.0)						(1.5)
As of September 30, 2025						$	(2.1)					$	(0.1)					$	(1.0)					$	(3.2)