Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of net periodic benefit cost
Pension settlement	$ 400,000	$ 0	$ 31,400,000
Discontinued Operations [Member]
Components of net periodic benefit cost
Total net periodic benefit cost	0
Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	5,300,000	5,000,000	4,400,000
Interest cost	12,300,000	12,600,000	15,300,000
Expected return on plan assets	(18,800,000)	(21,300,000)	(21,500,000)
Amortization of prior service cost	100,000	200,000	300,000
Amortization of net loss	9,200,000	8,100,000	7,600,000
Settlements or curtailments	700,000	700,000	31,600,000
Total net periodic benefit cost	$ 8,800,000	$ 5,300,000	$ 37,700,000