Intangible Assets Subject to Amortization (Tables)

12 Months Ended

Dec. 31, 2022

Intangible Assets Subject to Amortization

Schedule of intangible assets subject to amortization consist primarily of customer relationships and changes in the carrying amounts

	January 1,						December 31,
	2022		Acquisitions		Amortization		2022
	(in millions)
Other	$	1.7	$	—	$	(0.4)	$	1.3

	January 1,						December 31,
	2021		Acquisitions		Amortization		2021
	(in millions)
Other	$	1.9	$	0.2	$	(0.4)	$	1.7

Schedule of amortization expenses of the intangible assets

	Amortization
	(in millions)
2023	$	0.4
2024		0.3
2025		0.2
2026		0.2
2027		0.1
Thereafter		0.1
	$	1.3