Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in-Capital	Accumulated Other Comprehensive Loss	Company Shares Held by DCP, at Cost	Retained Earnings	Noncontrolling Interest
Balance at beginning of period (in shares) at Dec. 31, 2022		22,624,031
Balance at beginning of period at Dec. 31, 2022	$ 626.9	$ 4.5	$ 135.8	$ (40.1)	$ (1.1)	$ 527.8	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	33.7					33.5	0.2
Other comprehensive income (loss)	2.1			2.0			0.1
Dividends	(11.8)		0.1			(11.9)
Share-based compensation	4.1		4.1
Issuance of common stock under incentive plan (in shares)		116,604
Withholding tax paid upon equity award vesting	(1.6)		(1.6)
Deferred compensation programs' transactions, net	0.3				0.3
Balance at end of period (in shares) at Dec. 31, 2023		22,740,635
Balance at end of period at Dec. 31, 2023	653.7	$ 4.5	138.4	(38.1)	(0.8)	549.4	0.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	4.1					4.3	(0.2)
Other comprehensive income (loss)	(13.3)			(13.0)			(0.3)
Dividends	(11.9)		0.1			(12.0)
Share-based compensation	5.0		5.0
Issuance of common stock under incentive plan (in shares)		63,341
Issuance of common stock under incentive plan	0.1	$ 0.1
Withholding tax paid upon equity award vesting	(0.5)		(0.5)
Deferred compensation programs' transactions, net	$ 0.4		(0.1)		0.5
Balance at end of period (in shares) at Dec. 31, 2024	22,803,976	22,803,976
Balance at end of period at Dec. 31, 2024	$ 637.6	$ 4.6	142.9	(51.1)	(0.3)	541.7	(0.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	38.8					38.8	0.0
Other comprehensive income (loss)	10.6			10.5			0.1
Dividends	(11.9)		0.3			(12.2)
Share-based compensation	7.1		7.1
Issuance of common stock under incentive plan (in shares)		73,554
Withholding tax paid upon equity award vesting	(0.7)		(0.7)
Deferred compensation programs' transactions, net	$ 0.1				0.1
Balance at end of period (in shares) at Dec. 31, 2025	22,877,530	22,877,530
Balance at end of period at Dec. 31, 2025	$ 681.6	$ 4.6	$ 149.6	$ (40.6)	$ (0.2)	$ 568.3	$ (0.1)