Recent Accounting Pronouncements Recent Accounting Pronouncements (Impact of Adoption - ASU 2014-09) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Item Effected [Line Items]
Cost of sales	$ 1,813.6	$ 1,889.3	$ 5,232.2	$ 5,498.5
Income tax provision (benefit)	55.9	(4.0)	46.4	22.9
Net earnings (loss)	185.7	189.8	245.9	(3.7)
Revenues	2,972.1	2,961.7	8,322.5	8,308.7
Prepaid expenses and other current assets	684.1		684.1			$ 552.0
Income taxes payable	343.3		343.3			213.0
Retained earnings	6,277.0		6,277.0			6,031.1
Accumulated other comprehensive loss	$ (1,423.8)	$ (2,191.2)	$ (1,423.8)	$ (2,191.2)	$ (2,024.9)	$ (1,797.2)	$ (1,541.7)