Employee Benefit Plans (Employee Savings and Stock Ownership Plan - Shares) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Stock Ownership Plan (ESOP) Disclosures
Shares contributed to ESOP (in shares)	10,157	11,077.000	9,918.000
Shares in ESOP (in shares)	62,205.000	72,362.000	83,439.000
Deferred shares, fair value	$ 3.6	$ 4.3	$ 4.5
Compensation expense	0.4	$ 0.3	$ 0.3
Defined Contribution Feature
Employee Stock Ownership Plan (ESOP) Disclosures
Compensation expense	$ 2.3