Employee Benefits (Multi-Employer Pension Plans) (Details) - USD ($) $ in Millions		12 Months Ended
	Jun. 01, 2011	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expense related to multi-employer plans		$ 580.7	$ 543.4	$ 527.9
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		482.6	453.1	436.8
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expense related to multi-employer plans		98.1	90.3	91.1
Contribution to the multi-employer plan		97.8	89.1	89.4
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		58.8	51.8	51.7
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		13.1	12.5	12.5
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		2.2	1.8	2.0
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		$ 1.5	$ 1.3	$ 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%