Acquisitions and Dispositions Classes of Assets and Liabilities (Details) - Discontinued Operations - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets:
Current assets	$ 4,676.0	$ 4,519.8
Property and equipment, net	9,037.5	8,614.0
Goodwill	8,005.2	7,918.5
Other assets, net	3,190.4	3,230.4
Total assets	24,909.1	24,282.7
Liabilities:
Current portion of debt and finance lease obligations	2,865.9	2,699.5
Other accrued and current liabilities	2,144.6	2,207.3
Long-term debt and finance lease obligations	16,707.8	16,724.1
Other long-term liabilities	1,375.6	1,566.3
Total liabilities	$ 23,093.9	$ 23,197.2