Retirement Plans - Components of Net Periodic Pension (Credit) Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Settlement loss	$ 0.0	$ 0.6	$ 0.0	$ (0.1)
United States
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.0	0.0	0.0
Interest cost	0.7	0.8	1.4	1.6
Expected return on plan assets	(1.0)	(1.2)	(2.0)	(2.4)
Amortization of net actuarial loss	0.3	0.3	0.6	0.6
Amortization of prior service credit	0.0	0.0	0.0	0.0
Net periodic pension (credit) cost	0.0	(0.1)	0.0	(0.2)
Settlement loss	0.0	0.6	0.0	0.6
Curtailment gain	0.0	0.0	0.0	0.0
Total pension (credit) cost	0.0	0.5	0.0	0.4
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1	0.1	0.2	0.2
Interest cost	0.1	0.2	0.2	0.4
Expected return on plan assets	(0.2)	(0.2)	(0.4)	(0.4)
Amortization of net actuarial loss	0.1	0.1	0.2	0.1
Amortization of prior service credit	0.0	(0.1)	0.0	(0.1)
Net periodic pension (credit) cost	0.1	0.1	0.2	0.2
Settlement loss	0.0	0.0	0.0	0.0
Curtailment gain	0.0	0.0	0.0	(0.7)
Total pension (credit) cost	$ 0.1	$ 0.1	$ 0.2	$ (0.5)