Employee Benefit Plans (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	$ (5.8)		$ (5.4)		$ (5.0)
Interest cost	17.5		17.8		17.6
Expected return on plan assets	(19.0)		(19.0)		(19.5)
Amortization of prior service cost	0.4		0.4		0.5
Amortization of net loss	8.7		7.0		5.1
Settlements or curtailments	7.1		1.7		1.4
Total net periodic benefit cost	20.5	[1]	13.3	[1]	10.1	[1]
Other Benefits [Member]
Components of net periodic benefit cost
Service cost	(0.2)		(0.8)		(0.6)
Interest cost	0.4		0.9		0.8
Expected return on plan assets	0		0		0
Amortization of prior service cost	(2.7)		(1.9)		(1.9)
Amortization of net loss	1.4		1.2		1.2
Settlements or curtailments	0		0		0
Total net periodic benefit cost	$ (0.7)	[1]	$ 1.0	[1]	$ 0.7	[1]

[1] Pension expense of $6.9 million, $0.8 million and $0.8 million is included in Loss for discontinued operations for the years ended December 31, 2012, 2011 and 2010 respectively.