Restructuring Restructuring (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Employees affected			400
Restructuring Reserve		$ 0.2
2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 3.7
Employees affected	760
Restructuring Reserve	$ 0.8
2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs		$ 7.2
Employees affected		700
Restructuring Reserve		$ 4.1
Other Restructuring Costs		$ 0.4
2014 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs			$ 11.0
Employees affected			150
Other Restructuring Costs			$ 1.7