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, 2022		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	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, 2023	22,740,635	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	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	22,764,963
Balance at Mar. 31, 2024	$ 650.5	$ 4.5	$ 139.3	$ (42.5)	$ (0.8)	$ 549.8	$ 0.2