Financing and Trade Receivables - Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 26, 2025	Dec. 31, 2024
Current Period Gross Write-offs
2025	$ 0.3
2024	13.0
2023	12.0
2022	6.0
2021	3.3
Prior	3.4
Total	38.0
PSAs
Financing Receivable, Credit Quality Indicator [Line Items]
2025	127.5
2024	114.6
2023	61.2
2022	24.9
2021	7.8
Prior	2.0
Total	338.0	$ 352.2
Current Period Gross Write-offs
2025	0.3
2024	12.9
2023	11.1
2022	4.8
2021	2.2
Prior	1.2
Total	32.5
PSAs | Less than 400
Financing Receivable, Credit Quality Indicator [Line Items]
2025	14.1
2024	5.1
2023	4.0
2022	1.7
2021	0.6
Prior	0.3
Total	25.8
PSAs | 400-599
Financing Receivable, Credit Quality Indicator [Line Items]
2025	13.5
2024	18.9
2023	9.2
2022	3.8
2021	1.2
Prior	0.4
Total	47.0
PSAs | 600-799
Financing Receivable, Credit Quality Indicator [Line Items]
2025	34.6
2024	36.1
2023	19.2
2022	7.8
2021	2.9
Prior	0.7
Total	101.3
PSAs | 800+
Financing Receivable, Credit Quality Indicator [Line Items]
2025	65.3
2024	54.5
2023	28.8
2022	11.6
2021	3.1
Prior	0.6
Total	163.9
Franchisee Notes
Financing Receivable, Credit Quality Indicator [Line Items]
2025	21.0
2024	21.4
2023	13.3
2022	11.7
2021	9.1
Prior	12.8
Total	89.3
Current Period Gross Write-offs
2025	0.0
2024	0.1
2023	0.9
2022	1.2
2021	1.1
Prior	2.2
Total	5.5
Franchisee Notes | Active distributors
Financing Receivable, Credit Quality Indicator [Line Items]
2025	20.9
2024	20.1
2023	9.0
2022	6.9
2021	6.0
Prior	5.7
Total	68.6
Franchisee Notes | Separated distributors
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0.1
2024	1.3
2023	4.3
2022	4.8
2021	3.1
Prior	7.1
Total	$ 20.7