Retirement Benefits - Schedule of Determined Using Net Asset Value (NAV) (Details) - Pension Benefits - USD ($) $ in Millions	Dec. 28, 2025	Dec. 29, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 286.9	$ 279.8	$ 289.1
NAV
Defined Benefit Plan Disclosure [Line Items]
Total assets	81.6	85.8
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total assets	205.3	194.0
Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total assets	0.0	0.0
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total assets	0.0	0.0
U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Total assets	0.1	0.1
U.S. equities | NAV
Defined Benefit Plan Disclosure [Line Items]
Total assets	0.0	0.0
U.S. equities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total assets	0.1	0.1
U.S. equities | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total assets	0.0	0.0
U.S. equities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total assets	0.0	0.0
Fixed income and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total assets	206.2	199.2
Fixed income and cash equivalents | NAV
Defined Benefit Plan Disclosure [Line Items]
Total assets	1.0	5.3
Fixed income and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total assets	205.2	193.9
Fixed income and cash equivalents | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total assets	0.0	0.0
Fixed income and cash equivalents | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total assets	0.0	0.0
Private equity
Defined Benefit Plan Disclosure [Line Items]
Total assets	68.2	60.8
Private equity | NAV
Defined Benefit Plan Disclosure [Line Items]
Total assets	68.2	60.8
Private equity | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total assets	0.0	0.0
Private equity | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total assets	0.0	0.0
Private equity | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total assets	0.0	0.0
Alternative investments- hedge funds, real estate and other
Defined Benefit Plan Disclosure [Line Items]
Total assets	12.4	19.7
Alternative investments- hedge funds, real estate and other | NAV
Defined Benefit Plan Disclosure [Line Items]
Total assets	12.4	19.7
Alternative investments- hedge funds, real estate and other | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total assets	0.0	0.0
Alternative investments- hedge funds, real estate and other | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total assets	0.0	0.0
Alternative investments- hedge funds, real estate and other | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 0.0	$ 0.0