Employee Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation of pension plans	$ 353,700,000	$ 341,100,000
Health care cost trend rate assumed	7.10%
Ultimate trend rate	4.50%
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Amount invested by plan	16,000,000
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	65.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	35.00%
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization of Net Gains (Losses)	(8,200,000)
Pension Contributions	500,000
Other postretirement benefits payments	22,900,000	25,100,000	27,200,000
Defined Benefit Plan, Plan Amendments	(23,000)	0
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of net prior service cost	8,000,000
Defined Benefit Plan, Amortization of Net Gains (Losses)	1,800,000
Defined Benefit Plan, Plan Amendments	$ 0	$ 0