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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of restricted stock unit and restricted stock activity The following table summarizes restricted stock unit (RSU) activity for the years ended December 31, 2021, 2020 and 2019:
Number of
RSUs
(in thousands)		Weighted-Average
Grant Date Fair
Value per Share		Weighted-Average
Remaining
Contractual Term
(years)		Aggregate
Intrinsic
Value
(in millions)
Unissued as of December 31, 20181,592.6 $51.88 
Granted392.8 $75.11 
Vested and issued(409.8)$50.40 
Forfeited(76.1)$65.37 
Unissued as of December 31, 20191,499.5 $57.63 
Granted314.9 $95.75 
Vested and issued(538.2)$50.63 
Forfeited(64.1)$79.77 
Unissued as of December 31, 20201,212.1 $69.47 
Granted358.0 $91.21 
Vested and issued(434.5)$74.69 
Forfeited(44.8)$87.43 
Unissued as of December 31, 20211,090.8 $77.19 0.7$152.1 
Vested and unissued as of December 31, 2021385.1 $55.97 
Schedule of performance shares award outstanding activity The following table summarizes performance stock unit (PSU) activity for the years ended December 31, 2021, 2020 and 2019:
Number of
PSUs
(in thousands)		Weighted Average
Grant Date Fair
Value per Share
Outstanding as of December 31, 2018999.7 $55.77 
Granted356.1 $71.22 
Vested and issued(407.3)$47.11 
Forfeited(29.3)$67.77 
Outstanding as of December 31, 2019919.2 $65.92 
Granted247.0 $98.01 
Vested and issued(285.0)$61.22 
Forfeited(27.6)$88.29 
Outstanding as of December 31, 2020853.6 $76.14 
Granted313.1 $91.01 
Vested and issued(287.0)$65.35 
Forfeited(22.4)$91.20 
Outstanding and Exercisable as of December 31, 2021857.3 $84.79 
Schedule of accumulated benefit obligation and reconciliations of the changes of defined benefit pension plan The following table presents the ABO and reconciliations of the changes in the PBO, the Plan assets and the accounting funded status of our defined benefit pension plan for the years ended December 31:
 Defined Benefit
Pension Plan
 20212020
Accumulated benefit obligation$215.1 $219.2 
Change in projected benefit obligation:
Projected benefit obligation at beginning of year$219.2 $218.0 
Interest cost4.7 6.4 
Actuarial loss 6.7 11.3 
Benefits paid(15.5)(16.5)
Projected benefit obligation at end of year$215.1 $219.2 
Change in plan assets:
Fair value of plan assets at beginning of year$232.5 $226.6 
Actual return on plan assets6.3 24.5 
Estimated expenses(1.5)(2.1)
Benefits paid(15.5)(16.5)
Fair value of plan assets at end of year$221.8 $232.5 
Over funded status$6.7 $13.3 
Amounts recognized in the statement of financial position consist of:
Noncurrent assets$6.7 $13.3 
Net amount recognized$6.7 $13.3 
Weighted average assumptions used to determine benefit obligations:
Discount rate2.77 %2.24 %
Rate of compensation increaseN/AN/A
Schedule of net periodic benefit costs The components of the net periodic benefit cost for the years ended December 31 are summarized below:
202120202019
Components of net periodic benefit cost:
Interest cost$4.7 $6.4 $8.9 
Expected return on plan assets(6.0)(8.0)(9.7)
Recognized net actuarial (gain)— (0.1)(0.1)
Amortization of prior service cost— 0.1 0.1 
Net periodic benefit (income)$(1.3)$(1.6)$(0.8)
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate2.77 %2.24 %4.21 %
Expected return on plan assets4.10 %3.45 %5.20 %
Rate of compensation increaseN/AN/AN/A
Schedule of target asset allocation and actual asset allocation for defined benefit pension plans The following table summarizes our target asset allocation as of December 31, 2021 and the actual asset allocation as of December 31, 2021 and 2020 for our Plan:
December 31, 2021December 31, 2021December 31, 2020
Target
Asset
Allocation		Actual
Asset
Allocation		Actual
Asset
Allocation
Debt securities82 %82 %81 %
Equity securities18 18 19 
Total100 %100 %100 %
Schedule of changes in the fair value of the Plan's investment
The Plan assets are measured at fair value. The following table summarizes, by level, within the fair value hierarchy, the investments of the Plan at fair value as of December 31, 2021 and 2020:
  Fair Value Measurements Using
 December 31, 2021Quoted
Prices in
Active
Markets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Money market accounts$5.0 $5.0 $— $— 
Mutual funds216.8 — 216.8 — 
Total assets$221.8 $5.0 $216.8 $— 
  Fair Value Measurements Using
 December 31, 2020Quoted
Prices in
Active
Markets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Money market accounts$4.8 $4.8 $— $— 
Mutual funds 227.7 — 227.7 — 
Total assets$232.5 $4.8 $227.7 $— 
Schedule of estimated future benefit payments Estimated future benefit payments for the next ten years under the Plan follow:
2022$16.5 
2023$15.7 
2024$15.4 
2025$14.9 
2026$14.7 
2027 through 2031$62.6 
Schedule of individually significant multiemployer pension plans
  Pension Protection
Act Zone Status		Funding
Improvement
or Rehabilitation
Plan Status
Pending /		Republic
Contributions to Plan		SurchargeExpiration Dates
Legal Plan NameEIN20202019Implemented202120202019Imposedof CBAs
Western Conference of
  Teamsters Pension Plan		91-6145047SafeSafeNo$52.2 $49.4 $45.1 NoVarious dates through
9/30/26
Local No. 731 I.B. of
   T. Pension Fund		36-6513567SafeSafeNo8.7 8.8 9.3 NoVarious dates through
1/31/24
Individually significant
  plans		60.9 58.2 54.4 
All other plansN/AN/AN/AN/A15.5 15.0 17.7 N/A
Total$76.4 $73.2 $72.1