Leases - Summary of Lease-Related Assets and Liabilities (Details) $ in Millions	Sep. 30, 2020 USD ($)
Operating leases:
Right-of-use asset	$ 58.8
Current portion of lease liabilities	18.3
Lease liabilities	47.5
Total operating lease liabilities	65.8
Finance leases:
Right-of-use asset	24.3
Current portion of lease liabilities	4.1
Lease liabilities	14.6
Total finance lease liabilities	$ 18.7