Retirement Benefits - Schedule of Basis Used to Measure Defined Benefit Plans Assets at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 52.4	$ 49.3
Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	2.0	3.3
Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	18.9	16.0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	31.5	30.0
U.S. Large Cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.2	0.2
U.S. Large Cap \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.2	0.2
U.S. Large Cap \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
U.S. Large Cap \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
U.S. Small / Mid Cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
U.S. Small / Mid Cap \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
U.S. Small / Mid Cap \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
U.S. Small / Mid Cap \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.8	0.8
International \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.8	0.8
International \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
International \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
U.S. Intermediate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	2.2	2.5
U.S. Intermediate \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
U.S. Intermediate \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	2.2	2.5
U.S. Intermediate \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
U.S. Long Term
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	3.1	3.1
U.S. Long Term \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
U.S. Long Term \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	3.1	3.1
U.S. Long Term \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
U.S. High Yield
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	1.0	0.7
U.S. High Yield \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
U.S. High Yield \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	1.0	0.7
U.S. High Yield \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	10.8	8.2
International \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.2	0.2
International \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	10.6	8.0
International \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
Other Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	31.5	30.0
Other Commingled Funds \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
Other Commingled Funds \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
Other Commingled Funds \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	31.5	30.0
Cash and Equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.8	2.1
Cash and Equivalents \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.8	2.1
Cash and Equivalents \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
Cash and Equivalents \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
Other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	2.0	1.7
Other \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
Other \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	2.0	1.7
Other \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 0.0	$ 0.0