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Employees (Tables)
 12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan Financial information related to our pension plans is presented below:
 
2018
 
2017
Change in projected benefit obligation:
 
 
 
Benefit obligation at beginning of the period (July 1, 2017 business combination)
$
146.9

 
$
145.2

Service cost
0.4

 
1.2

Interest cost
5.2

 
2.7

Actuarial (gain) loss
(9.9
)
 
6.5

Benefits paid
(9.1
)
 
(2.4
)
Other (effect of curtailment/settlement)
(2.5
)
 
(6.3
)
Projected benefit obligations at end of year
$
131.0

 
$
146.9

Change in plan assets:
 
 
 
Fair value of plan assets at beginning of the period (July 1, 2017 business combination)
$
108.8

 
$
96.1

Actual (loss) gain on plan assets
(8.2
)
 
9.8

Employer contribution
24.2

 
5.3

Benefits paid
(9.1
)
 
(2.4
)
Fair value of plan assets at end of year
$
115.7

 
$
108.8

Reconciliation of funded status:
 
 
 
Fair value of plan assets at end of year
$
115.7

 
$
108.8

Less projected benefit obligations at end of year
131.0

 
146.9

Under-funded status at end of year
$
(15.3
)
 
$
(38.1
)
Schedule of Net Periodic Benefit Cost Not yet Recognized The pre-tax amounts in accumulated other comprehensive loss that have not yet been recognized as components of net periodic benefit cost were as follows:
 
December 31,
 
2018
 
2017
Net actuarial loss
$
5.5

 
$
0.8

Prior service credit
—

 
—

Projected benefit obligations at end of year
$
5.5

 
$
0.8
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets The accumulated benefit obligation for each of our pension plans was in excess of the fair value of plan assets. The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for the pension plans were as follows:
 
December 31,
 
2018
 
2017
Projected benefit obligation
$
131.0

 
$
146.9

Accumulated benefit obligation
$
131.0

 
143.8

Fair value of plan assets
$
115.7

 
108.8
Schedule of Assumptions Used The weighted-average assumptions used to determine net periodic benefit costs were as follows:
 
Year Ended December 31,
 
2018
 
2017
Discount rate
3.60
%
 
3.80
%
Expected long-term rate of return on plan assets
7.33
%
 
7.45
%
Rate of compensation increase
3.00
%
 
3.00
%
The weighted-average assumptions used to determine benefit obligations were as follows:
 
December 31,
 
2018
 
2017
Discount rate
4.15
%
 
3.60
%
Rate of compensation increase
N/A

 
3.00
%
Schedule of Net Benefit Costs The components of net periodic benefit cost related to our benefit plans consisted of the following:
 
 
Year Ended December 31,
Components of net periodic benefit cost:
 
2018
 
2017
Service cost
 
$
0.4

 
$
1.2

Interest cost
 
5.2

 
2.7

Expected return on plan assets
 
(8.0
)
 
(2.7
)
Recognition of gain due to settlement
 
(0.1
)
 
—

Recognition of gain due to curtailment
 
(2.4
)
 
(6.1
)
Net periodic benefit cost
 
$
(4.9
)
 
$
(4.9
)
Schedule of Allocation of Plan Assets The fair value of our pension assets by category were as follows:
 
Quoted Prices in
Active Markets
For Identical
Assets or
Liabilities
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Consolidated
Total
Year Ended December 31, 2018
 
 
 
 
 
 
 
Equity securities:
 
 
 
 
 
 
 
U.S. companies
$
—

 
$
62.8

 
$
—

 
$
62.8

International companies
—

 
14.0

 
—

 
14.0

Debt securities:
 
 
 
 
 
 
 
Preferred securities
—

 
4.4

 
—

 
4.4

Bond securities
—

 
26.6

 
—

 
26.6

Real estate securities
—

 
7.9

 
—

 
7.9

Total
$
—

 
$
115.7

 
$
—

 
$
115.7

Year Ended December 31, 2017
 
 
 
 
 
 
 
Equity securities:
 
 
 
 
 
 
 
U.S. companies
$
67.1

 
$
—

 
$
—

 
$
67.1

International companies
18.3

 
—

 
—

 
18.3

Debt securities:
 
 
 
 
 
 
 
Preferred securities
4.6

 
—

 
—

 
4.6

Bond securities
—

 
9.5

 
—

 
9.5

Real estate securities
9.3

 
—

 
—

 
9.3

Total
$
99.3

 
$
9.5

 
$
—

 
$
108.8

The weighted-average asset allocation of our pension benefits plan assets were as follows:
 
Year Ended December 31,
 
2018
 
2017
Asset Category:
 
 
 
Equity securities
66.4
%
 
78.5
%
Debt securities
26.8
%
 
13.0
%
Real estate investment trust
6.8
%
 
8.5
%
   Total
100.0
%
 
100.0
%