Leases (Tables)

12 Months Ended

Dec. 31, 2021

Leases [Abstract]

Summary of Lease Expense Cost

The components of lease expense were as follows: 

	Year Ended December 31,
(In millions)	2021		2020		2019
Operating lease cost:
Amortization of right-of-use assets	$	5.6	$	4.5	$	2.7
Interest on lease liabilities	1.3		1.1		0.6
Total operating lease cost	$	6.9	$	5.6	$	3.3

Schedule of Leases Supplemental Balance Sheets

Supplemental balance sheet information related to leases was as follows:

		Year Ended December 31,
(In millions, except lease term and discount rate)	Balance Sheet Location	2021			2020
Operating lease right-of-use assets	Other assets	$	28.3		$	31.0
Operating lease liabilities, current portion	Other current liabilities	5.8			5.4
Operating lease liabilities	Other liabilities	24.2			27.8
Total operating lease liabilities		$	30.0		$	33.2
Operating leases:
Weighted average remaining lease term (years)		7.0			7.7
Weighted average discount rate		4.1		%	4.1		%

Lessee, Operating Lease, Liability, Maturity

Lease maturities as of December 31, 2021, are as follows:

(in millions)	Operating leases
2022	$	6.9
2023	6.9
2024	4.7
2025	3.1
2026	2.7
Thereafter	10.4
Total undiscounted lease liabilities	34.7
Less: Imputed interest	(4.7)
Total Lease liabilities	$	30.0