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Lease Accounting (Maturity of Lease Liability) (Details) $ in Millions	Mar. 31, 2021 USD ($)
Operating leases
2021	$ 30.9
2022	41.0
2023	40.0
2024	39.7
2025	39.3
After 2025	468.0
Total lease payments	658.9
less: interest	259.6
Present value of lease liabilities	399.3
Finance leases
2021	14.1
2022	18.0
2023	16.7
2024	15.2
2025	14.5
After 2025	148.9
Total lease payments	227.4
less: interest	90.0
Present value of lease liabilities	$ 137.4

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