Recent Accounting Pronouncements Recent Accounting Pronouncements (Impact of Adoption - ASU 2014-09) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Item Effected [Line Items]
Revenue, Net	$ 2,684.5	$ 2,719.5
Cost of sales	1,700.2	1,634.5
Income tax (benefit) provision	(76.6)	5.2
Net earnings	87.1	$ 66.4
Prepaid expenses and other current assets	728.0		$ 784.6	$ 766.1
Deferred income tax liability	2,042.4		2,018.1	2,012.4
Income taxes payable	31.6			112.9
Retained earnings	5,751.6		5,664.8	5,644.5
Accumulated other comprehensive loss	(191.5)		$ (368.7)	(361.2)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Item Effected [Line Items]
Revenue, Net	2,706.4
Cost of sales	1,725.8
Income tax (benefit) provision	(77.8)
Net earnings	84.6
Prepaid expenses and other current assets	724.3
Income taxes payable	30.4
Retained earnings	5,749.1
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Item Effected [Line Items]
Revenue, Net	(21.9)
Cost of sales	(25.6)
Income tax (benefit) provision	1.2
Net earnings	2.5
Prepaid expenses and other current assets	3.7
Income taxes payable	1.2
Retained earnings	$ 2.5
Accounting Standards Update 2014-09 [Member]
Item Effected [Line Items]
Prepaid expenses and other current assets				18.5
Deferred income tax liability				5.7
Retained earnings				12.8
Accounting Standards Update 2016-01 [Member]
Item Effected [Line Items]
Retained earnings				10.0
Accumulated other comprehensive loss				(10.0)
Accounting Standards Update 2017-12 [Member]
Item Effected [Line Items]
Retained earnings				(2.5)
Accumulated other comprehensive loss				$ 2.5