Reorganization and Restructuring (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2017 USD ($) position	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) position	Dec. 31, 2015 USD ($)
Reorganization and Restructuring 2016
Restructuring Cost and Reserve [Line Items]
Reorganization and restructuring costs	$ 18.1		$ 8.0
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance			7.6
Expense (benefit)			8.0
Payments and utilization			(10.8)
Foreign currency exchange effects			0.1
Restructuring Reserve, ending balance	7.6		4.9		$ 7.6
Reorganization and Restructuring 2015
Restructuring Cost and Reserve [Line Items]
Reorganization and restructuring costs				$ 4.4		$ 11.6
Positions eliminated across the global workforce | position					1,100
Expected cost savings					$ 20.0
Cumulative pretax charges	18.0				18.0
Asset Related Adjustments | Reorganization and Restructuring 2016
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance			0.0
Expense (benefit)			2.1
Payments and utilization			(2.1)
Foreign currency exchange effects			0.0
Restructuring Reserve, ending balance	0.0		0.0		0.0
Severance Costs | Reorganization and Restructuring 2016
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance			7.0
Expense (benefit)			3.7
Payments and utilization			(6.9)
Foreign currency exchange effects			0.1
Restructuring Reserve, ending balance	7.0		3.9		7.0
Severance Costs | Director | Executive Leadership and Board of Directors Restructuring
Restructuring Cost and Reserve [Line Items]
Reorganization and restructuring costs		$ 1.8		$ 3.8
Lease Terminations | Reorganization and Restructuring 2016
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance			0.6
Expense (benefit)			0.0
Payments and utilization			0.1
Foreign currency exchange effects			0.0
Restructuring Reserve, ending balance	0.6		0.7		0.6
Benefit Program Termination [Member] | Reorganization and Restructuring 2016
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance			0.0
Expense (benefit)			2.2
Payments and utilization			(1.9)
Foreign currency exchange effects			0.0
Restructuring Reserve, ending balance	$ 0.0		$ 0.3		$ 0.0
Minimum | Reorganization and Restructuring 2016
Restructuring Cost and Reserve [Line Items]
Positions eliminated across the global workforce | position			800
Expected cost savings			$ 8.0
Expected costs			$ 14.0
Maximum | Reorganization and Restructuring 2016
Restructuring Cost and Reserve [Line Items]
Positions eliminated across the global workforce | position			900
Expected cost savings			$ 12.0
Expected costs			$ 18.0