Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation of pension plans	$ 301.3	$ 353.7
Health care cost trend rate assumed	7.10%
Ultimate trend rate	4.50%
Effect of one percentage point increase on postretirement benefit obligation	$ 9.4
Effect of one percentage point increase on postretirement benefit cost	0.1
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Amount invested by plan	$ 16.0
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations (percent)	60.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations (percent)	40.00%
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of net gains (losses)	$ (3.0)
Pension Contributions	0.5
Other postretirement benefits payments	20.5	$ 22.9	$ 25.1
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of net gains (losses)	2.3
Amortization of net prior service cost	$ 10.7