Supplemental Cash Flow Data (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Change in Operating Capital [Abstract]
(Increase) decrease in accounts receivable	$ 626.8	$ 973.2
(Increase) decrease in work in process and other current assets	(214.2)	(271.9)
Increase (decrease) in accounts payable	(1,141.9)	(1,522.1)
Increase (decrease) in customer advances, taxes payable and other current liabilities	(15.8)	(181.3)
Change in other assets and liabilities, net	8.8	6.0
Use of operating capital	(736.3)	(996.1)
Income taxes paid	63.5	83.2
Interest paid	59.4	$ 55.8
Operating Leases, Net increase in lease liability	1,505.9
Finance Leases, Net increase in lease liability	$ 14.1