Restructuring Restructuring (Details) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Severance Costs		$ 12.8
Employees affected		315
Restructuring Reserve	$ 8.2	$ 8.2		$ 10.2
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	1.7	$ 3.9
Employees affected		250
Restructuring Reserve	0.8	$ 0.8		1.4
2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs			$ 3.7
Employees affected			760
buw Acquisition [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	0.1	1.0
Restructuring Reserve	$ 0.5	$ 0.5		$ 0.5