Pension and Post-retirement Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension Benefits
Components of net periodic benefit cost [Abstract]
Service cost	$ 0.7	$ 0.5	$ 1.5	$ 1.2
Interest cost	1.7	2.2	4.0	4.1
Expected return on plan assets	(2.8)	(2.6)	(5.5)	(5.3)
Amortization of prior service credit	(0.2)	(0.2)	(0.4)	(0.4)
Amortization of net loss	2.5	0.1	3.5	2.0
Net periodic benefit cost	1.9	0.0	3.1	1.6
United States Postretirement Benefit Plans of US Entity, Defined Benefit
Components of net periodic benefit cost [Abstract]
Service cost	0.1	0.0	0.1	0.1
Interest cost	0.0	0.1	0.2	0.2
Expected return on plan assets	0.0	0.0	0.0	0.0
Amortization of prior service credit	0.0	0.0	0.0	0.0
Amortization of net loss	0.0	0.0	0.1	0.1
Net periodic benefit cost	$ 0.1	$ 0.1	$ 0.4	$ 0.4