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, 2021		22,767,052
Balance at Dec. 31, 2021	$ 651.3	$ 4.5	$ 130.6	$ (32.4)	$ (1.2)	$ 549.3	$ 0.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	4.1					4.1
Other comprehensive income (loss)	4.2			4.1			0.1
Dividends	(2.8)					(2.8)
Share-based compensation	1.8		1.8
Issuance of common stock under incentive plan (in shares)		69,995
Issuance of common stock under incentive plan	0.1	$ 0.1
Withholding tax paid upon equity award vesting	(1.3)		(1.3)
Balance (in shares) at Mar. 31, 2022		22,837,047
Balance at Mar. 31, 2022	657.4	$ 4.6	131.1	(28.3)	(1.2)	550.6	0.6
Balance (in shares) at Dec. 31, 2021		22,767,052
Balance at Dec. 31, 2021	651.3	$ 4.5	130.6	(32.4)	(1.2)	549.3	0.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0.7
Other comprehensive income (loss)	(13.5)
Balance (in shares) at Sep. 30, 2022		22,710,427
Balance at Sep. 30, 2022	628.1	$ 4.5	134.4	(46.0)	(1.1)	535.9	0.4
Balance (in shares) at Mar. 31, 2022		22,837,047
Balance at Mar. 31, 2022	657.4	$ 4.6	131.1	(28.3)	(1.2)	550.6	0.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(3.9)					(3.9)
Other comprehensive income (loss)	(8.5)			(8.5)
Dividends	(2.6)		0.1			(2.7)
Share-based compensation	1.6		1.6
Issuance of common stock under incentive plan (in shares)		27,482
Withholding tax paid upon equity award vesting	(0.3)		(0.3)
Deferred compensation programs' transactions, net	0.2		0.1		0.1
Balance (in shares) at Jun. 30, 2022		22,864,529
Balance at Jun. 30, 2022	643.9	$ 4.6	132.6	(36.8)	(1.1)	544.0	0.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0.5					0.7	(0.2)
Other comprehensive income (loss)	(9.2)			(9.2)
Dividends	(2.8)					(2.8)
Share-based compensation	2.0		2.0
Issuance of common stock under incentive plan (in shares)		6,343
Withholding tax paid upon equity award vesting	(0.2)		(0.2)
Share repurchases (in shares)		(160,445)
Share repurchases	(6.1)	$ (0.1)				(6.0)
Balance (in shares) at Sep. 30, 2022		22,710,427
Balance at Sep. 30, 2022	$ 628.1	$ 4.5	134.4	(46.0)	(1.1)	535.9	0.4
Balance (in shares) at Dec. 31, 2022	22,624,031	22,624,031
Balance 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)	12.1					12.1
Other comprehensive income (loss)	0.1						0.1
Dividends	(2.9)					(2.9)
Share-based compensation	0.8		0.8
Issuance of common stock under incentive plan (in shares)		66,536
Withholding tax paid upon equity award vesting	(1.4)		(1.4)
Balance (in shares) at Mar. 31, 2023		22,690,567
Balance at Mar. 31, 2023	$ 635.6	$ 4.5	135.2	(40.1)	(1.1)	537.0	0.1
Balance (in shares) at Dec. 31, 2022	22,624,031	22,624,031
Balance 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)	18.8
Other comprehensive income (loss)	$ (4.0)
Balance (in shares) at Sep. 30, 2023	22,739,296	22,739,296
Balance at Sep. 30, 2023	$ 634.8	$ 4.5	137.7	(44.2)	(1.0)	537.5	0.3
Balance (in shares) at Mar. 31, 2023		22,690,567
Balance at Mar. 31, 2023	635.6	$ 4.5	135.2	(40.1)	(1.1)	537.0	0.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	13.2					13.1	0.1
Other comprehensive income (loss)	0.5			0.5
Dividends	(3.0)					(3.0)
Share-based compensation	1.4		1.4
Issuance of common stock under incentive plan (in shares)		46,003
Withholding tax paid upon equity award vesting	(0.2)		(0.2)
Balance (in shares) at Jun. 30, 2023		22,736,570
Balance at Jun. 30, 2023	647.5	$ 4.5	136.4	(39.6)	(1.1)	547.1	0.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(6.5)					(6.6)	0.1
Other comprehensive income (loss)	(4.6)			(4.6)
Dividends	(3.0)					(3.0)
Share-based compensation	1.3		1.3
Issuance of common stock under incentive plan (in shares)		2,726
Deferred compensation programs' transactions, net	$ 0.1		0.0		0.1
Balance (in shares) at Sep. 30, 2023	22,739,296	22,739,296
Balance at Sep. 30, 2023	$ 634.8	$ 4.5	$ 137.7	$ (44.2)	$ (1.0)	$ 537.5	$ 0.3