Equity Method Investments (Income Statement) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Equity Method Investments [Line Items]
Revenues	$ 2,731.2	$ 2,851.5	$ 5,350.4	$ 5,347.0
Gross loss	1,025.7	932.6	1,931.8	1,737.8
Operating and non-operating expense	20.0	(52.1)	50.7	(166.6)
Net earnings (loss)	39.4	(168.5)	60.2	(193.5)
Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	87.8	85.6	175.3	172.5
Gross loss	(1.1)	(1.0)	(2.2)	(2.0)
Operating and non-operating expense	4.5	4.2	9.2	9.1
Net earnings (loss)	$ (5.6)	$ (5.2)	$ (11.4)	$ (11.1)