Pension and Post-retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.2	$ 1.1	$ 2.3	$ 2.2
Interest cost	4.3	4.4	8.6	8.8
Expected return on plan assets	(5.4)	(5.7)	(10.7)	(11.3)
Amortization of prior service cost	0.0	0.1	0.1	0.2
Recognized actuarial loss	2.4	1.6	4.8	3.2
Settlements and curtailments	0.1	0.0	0.4	0.0
Net periodic benefit cost	2.6	1.5	5.5	3.1
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.0	0.0	0.0	0.0
Interest cost	0.1	0.1	0.1	0.1
Expected return on plan assets	0.0	0.0	0.0	0.0
Amortization of prior service cost	(0.8)	(0.8)	(1.5)	(1.5)
Recognized actuarial loss	0.4	0.4	0.8	0.7
Settlements and curtailments	0.0	0.0	0.0	0.0
Net periodic benefit cost	$ (0.3)	$ (0.3)	$ (0.6)	$ (0.7)