Revenue - Contract Balances (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Contract with Customer, Asset, after Allowance for Credit Loss, Current	$ 1,414.4		$ 1,414.4		$ 1,520.0
Contract (liabilities)	4,685.4		4,685.4		4,585.1
Net contract liabilities	(3,271.0)		(3,271.0)		$ (3,065.1)
Contract assets, increase (decrease)			$ (105.6)
Contract with Customer, Asset, Net, Current, Increase (Decrease), Percent			(6.90%)
Contract (liabilities), (increase) decrease			$ (100.3)
Contract with Customer Liability, Current, Increase (Decrease), Percent			2.20%
Net contract assets (liabilities), increase (decrease)			$ (205.9)
Contract Assets (Liabilities), Current, Net, Increase (Decrease), Percent			(6.70%)
Contract with Customer, Liability, Revenue Recognized	457.3	$ 1,147.1	$ 874.4	$ 2,014.3
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 101.6	$ 325.7	$ 158.9	$ 493.4