Restructuring and Repositioning Expenses - Repositioning Expenses (Details) - Repositioning - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 4.7	$ 0.0	$ 9.0	$ 0.0
Professional fees
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	2.1		4.2
Software and IT implementation fees
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1.7		1.7
Employee-related costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 0.9		$ 3.1