Accounting Policies - Schedule of Estimated Cash Payments to Settle Claims (Details) $ in Millions	Dec. 31, 2021 USD ($)
Liability for Claims and Claims Adjustment Expense [Line Items]
2022	$ 115.3
2023	74.5
2024	48.0
2025	31.2
2026	19.2
Thereafter	84.8
Total	373.0
Workers’ Compensation
Liability for Claims and Claims Adjustment Expense [Line Items]
2022	77.6
2023	45.1
2024	29.0
2025	21.0
2026	14.5
Thereafter	80.1
Total	267.3
Third-Party Liability Claims
Liability for Claims and Claims Adjustment Expense [Line Items]
2022	37.7
2023	29.4
2024	19.0
2025	10.2
2026	4.7
Thereafter	4.7
Total	$ 105.7