Employee Benefits (Multi-Employer Pension Plans) (Details) - USD ($) $ in Millions		12 Months Ended
	Jun. 01, 2011	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expense related to multi-employer plans		$ 614.8	$ 580.7	$ 543.4
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		499.3	482.6	453.1
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expense related to multi-employer plans		115.5	98.1	90.3
Contribution to the multi-employer plan		112.6	97.8	89.1
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		70.7	58.8	51.8
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		14.7	13.1	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	2.2	1.8
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		$ 1.8	$ 1.5	$ 1.3
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%