Pensions and Postretirement Benefits - Summary of Pension Plan Asset Allocation By Level (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 169.9	$ 161.3
Common stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	32.4	30.7
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	65.3	63.1
Foreign stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	7.8	6.8
U.S. Government obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	8.9	8.5
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	6.4	6.4
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	14.9	16.0
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	6.8	5.9
Common collective trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	5.8	3.2
Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	26.1	20.7
Multi-year 420 transfer
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	(4.5)	0.0
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	142.5	137.4
Level 1 | Common stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	32.4	30.7
Level 1 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	65.3	63.1
Level 1 | Foreign stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	7.8	6.8
Level 1 | U.S. Government obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	8.9	8.5
Level 1 | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	6.4	6.4
Level 1 | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	14.9	16.0
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 6.8	$ 5.9