Employee Benefit Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 8.5
Estimated minimum contributions	35.2
Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	0.5
Estimated minimum contributions	$ 1.5