Restructuring Activities - Schedule of Approved Restructuring Spending (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Total Restructuring Program Range
Other expenses associated with the Program	$ 21.3	$ (0.4)	$ 38.0	$ 1.8
Total charges	50.6	7.5	74.7	18.3
Capital expenditures	1.8	$ 0.3	2.3	$ 0.5
Program
Total Restructuring Program Range
Other expenses associated with the Program	21.3		38.0
Less Cumulative Spend to Date
Costs of reduction in headcount as a result of reorganization	(322.0)		(322.0)
Other expenses associated with the Program	(174.0)		(174.0)
Total expense	(496.0)		(496.0)
Capital expenditures	(238.0)		(238.0)
Total estimated cash cost	(734.0)		(734.0)
Program | Minimum
Total Restructuring Program Range
Restructuring And Related Cost Of Reduction			355.0
Other expenses associated with the Program			230.0
Total charges			585.0
Capital expenditures			255.0
Total estimated net cash cost	840.0		840.0
Restructuring and Related Cost, Expected Cost [Abstract]
Costs of reduction in headcount as a result of reorganization	33.0		33.0
Other expenses associated with the Program	56.0		56.0
Total expense	89.0		89.0
Capital expenditures	17.0		17.0
Total estimated cash cost	106.0		106.0
Program | Maximum
Total Restructuring Program Range
Restructuring And Related Cost Of Reduction			370.0
Other expenses associated with the Program			245.0
Total charges			615.0
Capital expenditures			270.0
Total estimated net cash cost	885.0		885.0
Restructuring and Related Cost, Expected Cost [Abstract]
Costs of reduction in headcount as a result of reorganization	48.0		48.0
Other expenses associated with the Program	71.0		71.0
Total expense	119.0		119.0
Capital expenditures	32.0		32.0
Total estimated cash cost	$ 151.0		$ 151.0