Employee Benefit Plans (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	$ 4,200,000		$ 5,200,000		$ 5,800,000
Interest cost	17,700,000		16,200,000		17,500,000
Expected return on plan assets	(22,700,000)		(20,700,000)		(19,000,000)
Amortization of prior service cost	300,000		400,000		400,000
Amortization of net loss	6,600,000		9,200,000		8,700,000
Settlements or curtailments	400,000		1,500,000		7,100,000
Total net periodic benefit cost	6,500,000	[1]	11,800,000	[1]	20,500,000	[1]
Other Postretirement Benefit Plan [Member]
Components of net periodic benefit cost
Service cost	0		0		200,000
Interest cost	200,000		200,000		400,000
Expected return on plan assets	0		0		0
Amortization of prior service cost	(3,100,000)		(3,100,000)		(2,700,000)
Amortization of net loss	1,500,000		1,500,000		1,400,000
Settlements or curtailments	0		0		0
Total net periodic benefit cost	$ (1,400,000)	[1]	$ (1,400,000)	[1]	$ (700,000)	[1]

[1] Pension expense of $0.2 million and $6.9 million was included in Loss for discontinued operations for the years ended December 31, 2013 and 2012, respectively.