Leases - Operating Lease Maturity (Details) $ in Millions	Sep. 30, 2021 USD ($)
Finance Leases
2022	$ 5.6
2023	3.5
2024	1.9
2025	1.6
2026	1.6
Thereafter	2.8
Total undiscounted lease payments	17.0
Less imputed interest	(1.5)
Total lease liabilities	15.5
Operating Leases
2022	96.2
2023	81.3
2024	62.9
2025	45.5
2026	33.0
Thereafter	110.1
Total undiscounted lease payments	429.0
Less imputed interest	(25.5)
Total lease liabilities	$ 403.5