Supplemental Cash Flow Data (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Change in Operating Capital [Abstract]
(Increase) decrease in accounts receivable	$ 876.6	$ 626.8
(Increase) decrease in work in process and other current assets	(115.0)	(214.2)
Increase (decrease) in accounts payable	(2,084.9)	(1,141.9)
Increase (decrease) in customer advances, taxes payable and other current liabilities	(14.1)	(15.8)
Change in other assets and liabilities, net	(11.8)	8.8
Use of operating capital	(1,349.2)	(736.3)
Income taxes paid	50.5	63.5
Interest paid	31.2	59.4
Operating leases, Net increase in lease liability	72.0	1,505.9
Finance leases, Net increase in lease liability	$ 8.5	$ 14.1