Employee Benefits - Schedule of Pension Amounts Contributed by Funds Considered to be Individually Significant (Details) - Pension - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	$ 115.0	$ 128.8	$ 112.6
Central States, Southeast and Southwest Areas Pension Fund
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	69.0	77.7	70.7
Teamsters National 401 (k) Savings Plan
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	17.5	19.0	14.7
Road Carriers Local 707 Pension Fund
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	1.9	2.5	2.2
Teamsters Local 641 Pension Fund
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	$ 1.9	$ 2.1	$ 1.8