Supplemental Cash Flow Data (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Change in Operating Capital [Abstract]
(Increase) decrease in accounts receivable	$ 1,019.0	$ 467.3
(Increase) decrease in work in process and other current assets	(329.7)	(336.8)
Increase (decrease) in accounts payable	(1,551.7)	(697.8)
Increase (decrease) in customer advances and other current liabilities	(23.9)	26.1
Change in other assets and liabilities, net	79.2	(18.3)
Change in operating capital	(807.1)	(559.5)
Income taxes paid	135.5	144.3
Interest paid	$ 41.5	$ 35.2