Restructuring (Restructuring Charges) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 95.5	$ 96.2	$ 90.7	$ 95.5	$ 107.0
Restructuring Charges	80.8	76.1	45.4
Document Fiscal Year Focus				2018
Payments for Restructuring	(26.8)	(39.3)	(31.5)
Restructuring and Related Cost, Incurred Cost	(54.6)	(28.0)	(30.8)
Restructuring Reserve, Translation and Other Adjustment	(0.1)	(3.3)	0.6
Restructuring Reserve, Current	80.9			$ 80.9	91.5
North America Segment
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	49.7			108.1
Europe Segment
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	28.5			79.9
Rest of World Segment
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	2.6			13.3
Corporate / Other
Restructuring Cost and Reserve [Line Items]
Restructuring Charges				1.0
Employee Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	77.8	81.2	79.9	77.8	92.9
Restructuring Charges	16.2	35.1	15.1
Payments for Restructuring	(19.3)	(31.1)	(28.7)
Restructuring and Related Cost, Incurred Cost	0.0	0.0	0.0
Restructuring Reserve, Translation and Other Adjustment	(0.3)	(2.7)	0.6
Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	17.7	15.0	10.8	$ 17.7	$ 14.1
Restructuring Charges	64.6	41.0	30.3
Payments for Restructuring	(7.5)	(8.2)	(2.8)
Restructuring and Related Cost, Incurred Cost	(54.6)	(28.0)	(30.8)
Restructuring Reserve, Translation and Other Adjustment	$ 0.2	$ (0.6)	$ 0.0