Supplemental Cash Flow Data (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in Operating Capital [Abstract]
(Increase) decrease in accounts receivable	$ 141.2	$ (156.6)	$ 88.3
(Increase) decrease in work in process and other current assets	293.0	(99.8)	(269.3)
Increase (decrease) in accounts payable	(428.6)	276.3	242.9
Increase (decrease) in customer advances, taxes payable and other current liabilities	65.9	87.2	54.3
Change in other assets and liabilities, net	(40.6)	18.0	(35.7)
Increase in operating capital	30.9	125.1	80.5
Income taxes paid	376.5	361.0	590.9
Interest paid	205.5	246.3	$ 243.2
Operating leases, Net increase in lease liability	133.9	1,816.7
Finance leases, Net increase in lease liability	$ 32.1	$ 54.1