Supplemental Cash Flow Data (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in Operating Capital [Abstract]
(Increase) decrease in accounts receivable	$ 88.3	$ (341.6)	$ (376.5)
(Increase) decrease in work in process and other current assets	(269.3)	5.4	(89.7)
Increase (decrease) in accounts payable	242.9	763.2	741.9
Increase (decrease) in customer advances, taxes payable and other current liabilities	54.3	4.8	31.6
Change in other assets and liabilities, net	(35.7)	(83.3)	(4.5)
Increase in operating capital	80.5	348.5	302.8
Income taxes paid	590.9	566.0	570.4
Interest paid	$ 243.2	$ 226.2	$ 216.7