Equity Method Investments (Income Statement) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]
Revenues	$ 2,972.1	$ 2,961.7	$ 8,322.5	$ 8,308.7
Gross loss	1,158.5	1,072.4	3,090.3	2,810.2
Operating and non-operating expense	241.6	185.8	292.3	19.2
Net earnings (loss)	185.7	189.8	245.9	(3.7)
Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	113.5	101.6	288.8	274.1
Gross loss	(1.4)	(1.1)	(3.6)	(3.1)
Operating and non-operating expense	5.2	5.2	14.4	14.3
Net earnings (loss)	$ (6.6)	$ (6.3)	$ (18.0)	$ (17.4)