Employee Benefit Plans (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 24.1
Estimated minimum contributions	31.6
Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	1.3
Estimated minimum contributions	$ 1.5