Leases - Lease Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Lease Assets and Liabilities [Line Items]
Financing lease right of use assets - third party	$ 76.5	$ 80.4
Lease, Right-of-Use Asset	1,291.0	1,487.7
Operating Lease, Liability, Current	148.5
Current finance lease liabilities	13.2	14.4
Operating Lease, Liability, Noncurrent	1,063.6
Long-term financing lease liabilities - third party	66.0	68.3
Lease Liability	1,291.3	1,487.9
Third Party Lease [Member]
Lease Assets and Liabilities [Line Items]
Lease right of use assets - affiliate	663.9	836.3
Operating Lease, Liability, Current	61.6	78.3
Operating Lease, Liability, Noncurrent	599.9	755.9
Lease with Affiliate [Member]
Lease Assets and Liabilities [Line Items]
Lease right of use assets - affiliate	550.6	571.0
Operating Lease, Liability, Current	86.9	85.6
Operating Lease, Liability, Noncurrent	$ 463.7	$ 485.4