For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Percentage of contributions required by a collective bargaining arrangement to all contributions required of an employer related to a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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Amount of contributions made to the multiemployer plan by all employers who participate in the plan. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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Employee Benefits (Multi-Employer Pension Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 01, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expense related to multi-employer plans	$ 509.8yrcw_MultiemployerPlanPeriodExpense	$ 488.6yrcw_MultiemployerPlanPeriodExpense	$ 473.1yrcw_MultiemployerPlanPeriodExpense
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	416.2	399.5	387.5
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expense related to multi-employer plans	93.6	89.1	85.6
Contribution to the multi-employer plan	91.6	88.7	84.9
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	52.2	52.1	51.9
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	11.2	11.0
I.B. of T. Union Local No 710 Pension Fund [Member] \| Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	4.9	4.4	4.1
Central Pennsylvania Teamsters Defined Benefit Plan [Member] \| Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution to the multi-employer plan	4.3	4.5	4.5
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	2.3	2.3	2.5
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	$ 1.6	$ 1.6
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%