Revenue Contract Balances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Contract assets	$ 1,520.0	$ 1,295.0
Contract with Customer, Asset, Net, Current, Increase (Decrease)	$ 225.0
Contract with Customer, Asset, Net, Current, Increase (Decrease), Percent	17.40%
Contract liabilities	$ 4,585.1	4,085.1
Contract with Customer Liability, Current, Increase (Decrease)	$ 500.0
Contract with Customer Liability, Current, Increase (Decrease), Percent	12.20%
Contract assets (liabilities), Current, Net	$ (3,065.1)	(2,790.1)
Contract assets (liabilities), Current, Net, Increase (Decrease)	$ (275.0)
Costs in Excess of Billings (Billings in Excess of Cost), Current, Net, Increase (Decrease), Percent	(9.90%)
Contract with Customer, Liability, Revenue Recognized	$ 2,414.0	2,814.6
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 1,176.5	$ 596.9