Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in-Capital	Accumulated Other Comprehensive Loss	Company Shares Held by DCP	Retained Earnings	Noncontrolling Interest
Balance (in shares) at Dec. 31, 2023		22,740,635
Balance 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)	3.3					3.4	(0.1)
Other comprehensive income (loss)	(4.4)			(4.4)
Dividends	(2.9)		0.1			(3.0)
Share-based compensation	1.2		1.2
Issuance of common stock under incentive plan (in shares)		24,328
Withholding tax paid upon equity award vesting	(0.4)		(0.4)
Balance (in shares) at Mar. 31, 2024		22,764,963
Balance at Mar. 31, 2024	650.5	$ 4.5	139.3	(42.5)	(0.8)	549.8	0.2
Balance (in shares) at Dec. 31, 2023		22,740,635
Balance 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)	(16.9)
Other comprehensive income (loss)	0.0
Balance (in shares) at Sep. 30, 2024		22,801,785
Balance at Sep. 30, 2024	631.4	$ 4.6	141.6	(37.9)	(0.5)	523.6	0.0
Balance (in shares) at Mar. 31, 2024		22,764,963
Balance at Mar. 31, 2024	650.5	$ 4.5	139.3	(42.5)	(0.8)	549.8	0.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(14.0)					(14.0)
Other comprehensive income (loss)	(1.4)			(1.2)			(0.2)
Dividends	(3.0)					(3.0)
Share-based compensation	1.1		1.1
Issuance of common stock under incentive plan (in shares)		35,618
Issuance of common stock under incentive plan	0.1	$ 0.1
Withholding tax paid upon equity award vesting	(0.1)		(0.1)
Deferred compensation programs' transactions, net	0.1				0.1
Balance (in shares) at Jun. 30, 2024		22,800,581
Balance at Jun. 30, 2024	633.3	$ 4.6	140.3	(43.7)	(0.7)	532.8	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(6.2)					(6.2)
Other comprehensive income (loss)	5.8			5.8
Dividends	(3.0)					(3.0)
Share-based compensation	1.4		1.4
Issuance of common stock under incentive plan (in shares)		1,204
Deferred compensation programs' transactions, net	0.1		(0.1)		0.2
Balance (in shares) at Sep. 30, 2024		22,801,785
Balance at Sep. 30, 2024	$ 631.4	$ 4.6	141.6	(37.9)	(0.5)	523.6	0.0
Balance (in shares) at Dec. 31, 2024	22,803,976	22,803,976
Balance 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)	14.3					14.3
Other comprehensive income (loss)	3.1			3.0			0.1
Dividends	(2.9)		0.1			(3.0)
Share-based compensation	1.7		1.7
Issuance of common stock under incentive plan (in shares)		36,111
Withholding tax paid upon equity award vesting	(0.7)		(0.7)
Balance (in shares) at Mar. 31, 2025		22,840,087
Balance at Mar. 31, 2025	$ 653.1	$ 4.6	144.0	(48.1)	(0.3)	553.0	(0.1)
Balance (in shares) at Dec. 31, 2024	22,803,976	22,803,976
Balance 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)	26.9
Other comprehensive income (loss)	$ 9.1
Balance (in shares) at Sep. 30, 2025	22,875,841	22,875,841
Balance at Sep. 30, 2025	$ 669.0	$ 4.6	147.3	(42.2)	(0.2)	559.4	0.1
Balance (in shares) at Mar. 31, 2025		22,840,087
Balance at Mar. 31, 2025	653.1	$ 4.6	144.0	(48.1)	(0.3)	553.0	(0.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	16.8					16.7	0.1
Other comprehensive income (loss)	6.4			6.4
Dividends	(3.0)					(3.0)
Share-based compensation	1.5		1.5
Issuance of common stock under incentive plan (in shares)		34,626
Deferred compensation programs' transactions, net	0.1				0.1
Balance (in shares) at Jun. 30, 2025		22,874,713
Balance at Jun. 30, 2025	674.9	$ 4.6	145.5	(41.7)	(0.2)	566.7	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(4.2)					(4.2)
Other comprehensive income (loss)	(0.4)			(0.5)			0.1
Dividends	(3.0)		0.1			(3.1)
Share-based compensation	$ 1.7		1.7
Issuance of common stock under incentive plan (in shares)		1,128
Balance (in shares) at Sep. 30, 2025	22,875,841	22,875,841
Balance at Sep. 30, 2025	$ 669.0	$ 4.6	$ 147.3	$ (42.2)	$ (0.2)	$ 559.4	$ 0.1