Employee Benefits (Multi-Employer Pension Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 01, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expense related to multi-employer plans	$ 488.6	$ 473.1	$ 426.9
Employer pension contribution percentage				25.00%
Health and welfare [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expense related to multi-employer plans	399.5	387.5	378.2
Pension [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expense related to multi-employer plans	89.1	85.6	48.7
Contribution to the multi-employer plan	88.7	84.9	45.6
Central States, Southeast and Southwest Areas Pension Plan [Member] | Pension [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	52.1	51.9	27.6
Teamster National 401K Savings Plan [Member] | Pension [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	11.2	11.0	5.8
I.B. of T. Union Local No 710 Pension Fund [Member] | Pension [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	4.4	4.1	2.2
Central Pennsylvania Teamsters Defined Benefit Plan [Member] | Pension [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	4.5	4.5	2.3
Road Carriers Local 707 Pension Fund [Member] | Pension [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	2.3	2.5	1.2
Teamsters Local 641 Pension Fund [Domain] | Pension [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	$ 1.6	$ 1.6	$ 0.8
Workforce Subject to Collective Bargaining Arrangements [Member] | Labor Force Concentration Risk [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of labor force	78.00%