Leases - Lease Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Lease Assets and Liabilities [Line Items]
Lease, Right-of-Use Asset	$ 1,227.6	$ 1,487.7
Operating Lease, Liability, Current	153.7
Current finance lease liabilities	10.6	14.4
Operating Lease, Liability, Noncurrent	1,003.9
Long-term financing lease liabilities - third party	61.4	68.3
Total lease liabilities	1,229.6	1,487.9
Operating And Finance Lease, Right-Of-Use Asset
Lease Assets and Liabilities [Line Items]
Financing lease right of use assets - third party	68.7	80.4
Third Party Lease [Member]
Lease Assets and Liabilities [Line Items]
Operating Lease, Liability, Current	64.3	78.3
Operating Lease, Liability, Noncurrent	585.6	755.9
Third Party Lease [Member] | Operating And Finance Lease, Right-Of-Use Asset
Lease Assets and Liabilities [Line Items]
Lease right of use assets - affiliate	651.3	836.3
Lease with Affiliate [Member]
Lease Assets and Liabilities [Line Items]
Lease right of use assets - affiliate	507.6	571.0
Operating Lease, Liability, Current	89.4	85.6
Operating Lease, Liability, Noncurrent	418.3	485.4
Lease with Affiliate [Member] | Operating Lease, Right-of-Use Asset
Lease Assets and Liabilities [Line Items]
Lease right of use assets - affiliate	$ 507.6	$ 571.0