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Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |
Operating cash flows for operating leases | $ 4.7 | $ 6.8 | $ 17.6 | $ 26.4
Operating cash flows for finance leases | 1.1 | 0.1 | 2.9 | 0.5
Financing cash flows for finance leases | 2.8 | 0.2 | 5.6 | 8.1
Right-of-use assets obtained in exchange for lease obligations: |  |  |  |
Operating leases | 0.0 | 0.2 | 6.8 | 2.3
Finance leases | $ 1.1 | $ 0.5 | $ 21.3 | $ 1.5

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