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Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock option activity The following table summarizes stock option activity for the years ended December 31, 2018, 2017 and 2016:
 
Number of
Shares (in millions)
 
Weighted Average
Exercise
Price per Share
 
Weighted Average
Remaining
Contractual Term
(years)
 
Aggregate
Intrinsic
Value
(in millions)
Outstanding as of December 31, 2015
5.0

 
$
30.08

 
 
 
 
Granted

 

 
 
 
 
Exercised
(1.7
)
 
29.45

 
 
 
$
33.0

Forfeited or expired
(0.1
)
 
31.46

 
 
 
 
Outstanding as of December 31, 2016
3.2

 
30.35

 
 
 
 
Granted

 

 
 
 
 
Exercised
(1.3
)
 
29.80

 
 
 
$
42.1

Forfeited or expired

 

 
 
 
 
Outstanding as of December 31, 2017
1.9

 
30.72

 
 
 
 
Granted

 

 
 
 
 
Exercised
(0.9
)
 
29.73

 
 
 
$
36.5

Forfeited or expired

 

 
 
 
 
Outstanding and Exercisable as of December 31, 2018
1.0

 
$
31.65

 
1.3
 
$
39.6

Schedule of restricted stock unit and restricted stock activity The following table summarizes restricted stock unit (RSU) activity for the years ended December 31, 2018, 2017 and 2016:
 
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, 2015
1,727.3

 
$
34.15

 
 
 
 
Granted
640.4

 
45.01

 
 
 
 
Vested and issued
(370.6
)
 
30.03

 
 
 
 
Forfeited
(173.3
)
 
38.77

 
 
 
 
Unissued as of December 31, 2016
1,823.8

 
37.49

 
 
 
 
Granted
642.5

 
59.87

 
 
 
 
Vested and issued
(602.5
)
 
36.26

 
 
 
 
Forfeited
(87.9
)
 
47.86

 
 
 
 
Unissued as of December 31, 2017
1,775.9

 
45.48

 
 
 
 
Granted
467.4

 
64.32

 
 
 
 
Vested and issued
(565.0
)
 
41.50

 
 
 
 
Forfeited
(85.7
)
 
54.84

 
 
 
 
Unissued as of December 31, 2018
1,592.6

 
$
51.88

 
1.0
 
$
114.8

Vested and unissued as of December 31, 2018
578.4

 
$
39.24

 
 
 
 
Schedule of performance shares award outstanding activity The following table summarizes performance stock unit (PSU) activity for the years ended December 31, 2018, 2017 and 2016:
 
Number of
PSUs
(in thousands)
 
Weighted Average
Grant Date Fair
Value per Share
Unissued as of December 31, 2015
143.4

 
$
38.69

Granted
401.2

 
46.27

Vested and issued

 

Forfeited
(39.8
)
 
43.60

Unissued as of December 31, 2016
504.8

 
$
44.40

Granted
316.1

 
60.48

Vested and issued

 

Forfeited
(22.2
)
 
53.79

Unissued as of December 31, 2017
798.7

 
$
50.52

Granted
374.9

 
62.26

Vested and issued
(150.7
)
 
39.05

Forfeited
(23.2
)
 
59.76

Unissued as of December 31, 2018
999.7

 
$
55.77

Vested and unissued as of December 31, 2018
17.1

 
$
38.69

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
 
2018
 
2017
Accumulated benefit obligation
$
220.7

 
$
242.8

Change in projected benefit obligation:
 
 
 
Projected benefit obligation at beginning of year
$
242.8

 
$
239.1

Interest cost
8.2

 
9.3

Actuarial (gain) loss
(11.1
)
 
11.7

Benefits paid
(19.2
)
 
(17.3
)
Projected benefit obligation at end of year
$
220.7

 
$
242.8

Change in plan assets:
 
 
 
Fair value of plan assets at beginning of year
$
256.9

 
$
245.3

Actual return on plan assets
(6.0
)
 
30.6

Estimated expenses
(1.6
)
 
(1.7
)
Benefits paid
(19.2
)
 
(17.3
)
Fair value of plan assets at end of year
$
230.1

 
$
256.9

Over funded status
$
9.4

 
$
14.1

Amounts recognized in the statement of financial position consist of:
 
 
 
Noncurrent assets
$
9.4

 
$
14.1

Net amount recognized
$
9.4

 
$
14.1

Weighted average assumptions used to determine benefit obligations:
 
 
 
Discount rate
4.21
%
 
3.55
%
Rate of compensation increase
N/A

 
N/A

Schedule of net periodic benefit costs The components of the net periodic benefit cost for the years ended December 31 are summarized below:
 
2018
 
2017
 
2016
Components of net periodic benefit cost:
 
 
 
 
 
Interest cost
$
8.2

 
$
9.3

 
$
10.1

Expected return on plan assets
(11.3
)
 
(10.8
)
 
(11.5
)
Recognized net actuarial (gain)
(1.1
)
 
(0.4
)
 

Amortization of prior service cost
0.1

 
0.1

 
0.1

Net periodic benefit (income)
$
(4.1
)
 
$
(1.8
)
 
$
(1.3
)
Weighted average assumptions used to determine net periodic benefit cost:
 
 
 
 
 
Discount rate
3.55
%
 
4.07
%
 
4.19
%
Expected return on plan assets
5.35
%
 
5.36
%
 
5.56
%
Rate of compensation increase
N/A

 
N/A

 
N/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, 2018 and the actual asset allocation as of December 31, 2018 and 2017 for our Plan:
 
December 31, 2018
 
December 31, 2018
 
December 31, 2017
 
Target
Asset
Allocation
 
Actual
Asset
Allocation
 
Actual
Asset
Allocation
Debt securities
82
%
 
83
%
 
70
%
Equity securities
18

 
17

 
30

Total
100
%
 
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, 2018 and 2017:
 
 
 
Fair Value Measurements Using
 
Total as of December 31, 2018
 
Quoted
Prices in
Active
Markets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level  3)
Money market accounts
$
4.0

 
$
4.0

 
$

 
$

Mutual funds
226.1

 

 
226.1

 

Total assets
$
230.1

 
$
4.0

 
$
226.1

 
$

 
 
 
Fair Value Measurements Using
 
Total as of December 31, 2017
 
Quoted
Prices in
Active
Markets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level  3)
Money market accounts
$
3.0

 
$
3.0

 
$

 
$

Mutual funds
253.9

 

 
253.9

 

Total assets
$
256.9

 
$
3.0

 
$
253.9

 
$

Schedule of estimated future benefit payments Estimated future benefit payments for the next ten years under the Plan follow:
2019
$
20.4

2020
$
19.2

2021
$
18.5

2022
$
18.1

2023
$
17.2

2024 through 2028
$
74.1

Schedule of individually significant multiemployer pension plans There have been no significant changes that affect the comparability of the 2018, 2017 and 2016 contributions.
 
 
 
Pension Protection
Act Zone Status
 
Funding
Improvement
or Rehabilitation
Plan Status
Pending /
 
Republic
Contributions to Plan
 
Surcharge
 
Expiration Dates
Legal Plan Name
EIN
 
2017
 
2016
 
Implemented
 
2018
 
2017
 
2016
 
Imposed
 
of CBAs
Local 731 Private
  Scavengers and Garage
  Attendants Pension
  Trust Fund
36-6513567
 
Safe
 
Safe
 
Implemented
 
$
9.7

 
$
10.2

 
$
9.3

 
No
 
Various dates through
9/30/23
Western Conference of
  Teamsters Pension Plan
91-6145047
 
Safe
 
Safe
 
No
 
44.3

 
39.5

 
36.3

 
No
 
Various dates through
3/31/23
New England Teamsters
 & Trucking Industry
 Pension
04-6372430
 
Critical and Declining
 
Critical and Declining
 
Implemented
 
3.2

 
3.2

 
2.8

 
No
 
06/30/20
Midwest Operating
 Engineers Pension Fund
36-6140097
 
Endangered
 
Endangered
 
Implemented
 
2.1

 
2.2

 
2.0

 
No
 
Various dates through
5/31/21
Individually significant
  plans
 
 
 
 
 
 
 
 
59.3

 
55.1

 
50.4

 
 
 
 
All other plans
N/A
 
N/A
 
N/A
 
N/A
 
10.1

 
9.6

 
9.3

 
N/A
 
 
Total
 
 
 
 
 
 
 
 
$
69.4

 
$
64.7

 
$
59.7