Pension and Post-retirement Benefit Plans (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	$ 1.3		$ 1.4
Interest cost	4.1		4.3
Expected return on plan assets	(5.2)		(4.7)
Amortization of prior service cost	0.1		0.1
Recognized actuarial loss	2.4		2.2
Settlements or curtailments	0.5		0
Total net periodic benefit cost	3.2	[1]	3.3	[1]
Other Benefits [Member]
Components of net periodic benefit cost
Service cost	0		0.3
Interest cost	0.1		0.2
Expected return on plan assets	0		0
Amortization of prior service cost	(0.8)		(0.5)
Recognized actuarial loss	0.4		0.3
Settlements or curtailments
Total net periodic benefit cost	$ (0.3)	[1]	$ 0.3	[1]

[1] et periodic benefit cost for the three months ended March 31, 2013 and 2012 related to continuing operations.