Benefit Plans - Allocation of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	100.00%	100.00%
Fair value of plan assets	$ 249.2	$ 258.1
Pension plan assets in the fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	49.5	43.7
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.6	1.5
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	47.9	42.2
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0
Pension plan assets measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	199.7	214.4
Cash | Pension plan assets in the fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.6	1.5
Cash | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.6	1.5
Cash | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Cash | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0.0	$ 0.0
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	12.00%	34.00%
Equity securities | United States
Defined Benefit Plan Disclosure [Line Items]
Target allocation	5.00%
Equity securities | Pension plan assets in the fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 21.2	$ 20.6
Equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21.2	20.6
Equity securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0.0	$ 0.0
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	86.00%	64.00%
Debt securities | United States
Defined Benefit Plan Disclosure [Line Items]
Target allocation	95.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	2.00%	2.00%
Other | United States
Defined Benefit Plan Disclosure [Line Items]
Target allocation	0.00%
Mutual funds | Pension plan assets in the fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 22.1	$ 18.7
Mutual funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Mutual funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	22.1	18.7
Mutual funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Other mutual funds | Pension plan assets in the fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.6	2.9
Other mutual funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Other mutual funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.6	2.9
Other mutual funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0.0	$ 0.0
Minimum | Equity securities | United States
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	2.00%
Minimum | Debt securities | United States
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	92.00%
Minimum | Other | United States
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	0.00%
Maximum | Equity securities | United States
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	8.00%
Maximum | Debt securities | United States
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	98.00%
Maximum | Other | United States
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	3.00%