Leases Supplemental Balance Sheet (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 4,018.0	$ 4,239.1	$ 0.0
Operating Lease, Liability, Current	3,791.2	3,947.8
Operating lease obligations	251.6	$ 317.2
Operating Lease, Liability	4,042.8
Liabilities Subject To Compromise, Operating Lease Obligation	(4,040.7)
Operating Lease Liability, Net Amounts Reclassified to Liabilities Subject to Compromise	2.1
Finance Lease, Right-Of-Use Asset, Gross	257.2
Finance Lease, Right-Of-Use Asset, Accumulated Depreciation	(191.6)
Finance Lease, Right-of-Use Asset	65.6
Finance Lease, Liability, Current	23.3
Finance Lease, Liability, Noncurrent	25.6
Finance Lease, Liability	48.9
Liabilities Subject To Compromise, Finance Lease Obligations	(45.0)
Finance Lease Liability, Net Amounts Reclassified to Liabilities Subject to Compromise	$ 3.9
Operating Lease, Weighted Average Remaining Lease Term	10 years
Finance Lease, Weighted Average Remaining Lease Term	4 years 1 month 6 days
Sale Leaseback Transaction, Weighted Average Remaining Lease Term	10 years 9 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	13.90%
Finance Lease, Weighted Average Discount Rate, Percent	6.60%
Sale Leaseback Transaction, Weighted Average Discount Rate	8.60%
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Other current liabilities
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	$ 4,042.8
Other liabilities
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	$ 4,042.8