Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Land	$ 193.1	$ 192.7
Buildings	7,683.8	7,425.6
Equipment	8,817.4	8,689.0
Construction in progress	1,769.7	1,783.8
Property and equipment, gross	18,464.0	18,091.1
Less accumulated depreciation	(9,544.5)	(9,264.6)
Property and equipment, net	8,919.5	8,826.5
Depreciation expense	879.6	763.1	$ 716.2
Rental expense	223.2	$ 224.5	$ 221.0
Property, Plant and Equipment [Line Items]
2019	155.8
2020	128.0
2021	89.0
2022	74.7
2023	58.2
After 2023	$ 299.5
Building | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	12 years
Building | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	50 years
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	3 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	25 years