Employee Benefit Plans - Asset Category and Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 61.9	$ 53.9	$ 49.1
Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	59.9	52.1
Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 2.0	1.8	$ 0.3
Equity funds
Defined Benefit Plan Disclosure
Target Allocations by Asset Category	68.00%
Fair value of plan assets	$ 43.9	38.9
Equity funds | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	43.9	38.9
Equity funds | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 0.0	0.0
Fixed income funds
Defined Benefit Plan Disclosure
Target Allocations by Asset Category	26.00%
Fair value of plan assets	$ 16.0	13.2
Fixed income funds | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	16.0	13.2
Fixed income funds | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 0.0	0.0
Other investments
Defined Benefit Plan Disclosure
Target Allocations by Asset Category	6.00%
Fair value of plan assets	$ 2.0	1.8
Other investments | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Other investments | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 2.0	$ 1.8