Employee Benefit Plans (Textual) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended						9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Qualified Pension	Sep. 30, 2014 Post-retirement Healthcare	Aug. 28, 2014 OPEB Plan Participant	Aug. 02, 2014 OPEB Plan collective_bargaining_agreement	Sep. 30, 2014 OPEB Plan Qualified Pension Participant	Sep. 30, 2014 Associate Plan Subject to Collective Bargaining Arrangements Post-retirement Healthcare Participant
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Number of Participants									2,100	300
Agreements with labor unions								2
Number of participants terminated from plan							1,800
Expected employer contributions in current fiscal year					$ 35.0
Employer pension contribution year-to-date					22.5
Benefit contribution payments to post-retirement healthcare						$ 3.8
Actual return for qualified pension plan assets	(6.10%)	4.10%	4.90%	7.00%
Weighted average annualized expected return on qualified pension plan assets			7.80%