Employee Benefit Plans Change in Fair Value of Level 3 Pension Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Actual Return on Plan Assets [Abstract]
Beginning balance	$ 105.6	$ 64.5
Defined Benefit Plan Change in Fair Value of Plan Assets Level 3 Reconciliation, Period Increase (Decrease)	3.8	3.3
Purchases, sales and settlements, net	(13.2)	37.8
Ending balance	$ 96.2	$ 105.6