Employee Benefits (Other Plans) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate, benefit obligations	4.44%	3.77%
Noncash equity-based compensation and employee benefits expense	$ 20,300,000	$ 22,000,000	$ 21,000,000
Annual Incentive Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Incentive accruals	$ 29,800,000	$ 0	$ 0