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Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Operating Leases
2021	$ 6.6
2022	18.4
2023	16.8
2024	6.0
2025	3.4
2026 and thereafter	3.8
Total lease payments	55.0
Less imputed interest	(6.4)
Total lease liabilities	48.6	$ 66.6
Finance Leases
2021	2.8
2022	11.1
2023	5.6
2024	4.7
2025	4.5
2026 and thereafter	9.5
Total lease payments	38.2
Less imputed interest	(7.8)
Total finance lease liabilities	$ 30.4	$ 27.3

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