Employee Benefits (Other Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	$ (96.7)	$ 113.5	$ (122.5)
Settlement loss	$ (28.7)	$ 0.0	0.0
Discount rate, benefit obligations	4.81%	4.33%
Noncash equity based compensation and employee benefits expense	$ 24.4	$ 26.6	20.2
Management
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncash equity based compensation and employee benefits expense	14.1	2.9	6.3
Performance Incentive Awards
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Performance and sales incentive expense	$ 13.2	$ 13.9	$ 8.2