Employee Benefits (Multi-Employer Pension Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 01, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expense related to multi-employer plans	$ 543.4	$ 527.9	$ 509.8
Employer pension contribution percentage				25.00%
Health and welfare
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expense related to multi-employer plans	453.1	436.8	416.2
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expense related to multi-employer plans	90.3	91.1	93.6
Contribution to the multi-employer plan	89.1	89.4	91.6
Central States, Southeast and Southwest Areas Pension Plan [Member] | Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	51.8	51.7	52.2
Teamster National 401K Savings Plan [Member] | Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	12.5	12.5	13.1
Road Carriers Local 707 Pension Fund [Member] | Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	1.8	2.0	2.3
Teamsters Local 641 Pension Fund [Domain] | Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	$ 1.3	$ 1.5	$ 1.5
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%