Restructuring Initiatives Restructuring Initiatives (Liability Balance for Transformation Plan) (Details) - Transformation Plan [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Opening Balance	$ 51.4	$ 21.4
Charges	32.5	85.2	$ 21.4
Adjustments	22.3	(10.8)
Cash payments	(42.9)	(40.5)
Non-cash write-offs	(14.6)	(3.1)
Foreign exchange	0.5	(0.8)
Ending Balance	49.2	51.4	21.4
Employee Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Opening Balance	48.6	21.4
Charges	31.9	73.4	21.4
Adjustments	(5.0)	(10.8)
Cash payments	(34.8)	(34.6)
Non-cash write-offs	0.0	0.0
Foreign exchange	0.5	(0.8)
Ending Balance	41.2	48.6	21.4
Inventory/ Asset Write-Offs [Member]
Restructuring Cost and Reserve [Line Items]
Opening Balance	0.0	0.0
Charges	0.6	0.4	0.0
Adjustments	0.0	0.0
Cash payments	0.0	0.0
Non-cash write-offs	(0.6)	(0.4)
Foreign exchange	0.0	0.0
Ending Balance	0.0	0.0	0.0
Currency Translation Adjustment Write Offs [Member]
Restructuring Cost and Reserve [Line Items]
Opening Balance	0.0	0.0
Charges	0.0	2.7	0.0
Adjustments	0.0	0.0
Cash payments	0.0	0.0
Non-cash write-offs	0.0	(2.7)
Foreign exchange	0.0	0.0
Ending Balance	0.0	0.0	0.0
Contract Terminations/ Other [Member]
Restructuring Cost and Reserve [Line Items]
Opening Balance	2.8	0.0
Charges	0.0	8.7	0.0
Adjustments	27.3	0.0
Cash payments	(8.1)	(5.9)
Non-cash write-offs	(14.0)	0.0
Foreign exchange	0.0	0.0
Ending Balance	$ 8.0	$ 2.8	$ 0.0