Pension and Post-retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.1	$ 1.2	$ 2.2	$ 2.3
Interest cost	3.9	4.3	7.7	8.6
Expected return on plan assets	(5.7)	(5.4)	(10.8)	(10.7)
Amortization of prior service cost	0.1	0.0	0.1	0.1
Recognized actuarial loss	1.7	2.4	3.8	4.8
Settlements and curtailments	0.0	0.1	0.0	0.4
Net periodic benefit cost	1.1	2.6	3.0	5.5
Other Benefits [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	0.0	0.1	0.0	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	0.7	0.8
Settlements and curtailments	0.0	0.0	0.0	0.0
Net periodic benefit cost	$ (0.4)	$ (0.3)	$ (0.8)	$ (0.6)