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Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2022
Benefit Plans [Abstract]  
Pension Obligation and Funded Status

The following table set forth Company's pension obligation and funded status at December 31:

  
Pension Benefits
    
Post-Retirement Benefits
  
(millions of dollars)
  
2022
    
2021
    
2022
    
2021
  
Change in benefit obligations:
                        
Beginning projected benefit obligation
  
$
495.0
    
$
534.3
    
$
2.3
    
$
4.6
  
Service cost
    
6.6
      
7.7
      
—
      
0.1
  
Interest cost
    
11.0
      
7.9
      
—
      
0.1
  
Actuarial gain
    
(124.2
)
    
(23.8
)
    
(0.4
)
    
(0.3
)
Benefits paid
    
(12.4
)
    
(12.4
)
    
(0.1
)
    
(0.5
)
Settlements
    
(18.4
)
    
(16.3
)
    
—
      
(1.6
)
Foreign exchange impact
    
(9.0
)
    
(2.7
)
    
—
      
(0.1
)
Other
    
0.3
      
0.3
      
—
      
—
  
Ending projected benefit obligation
    
348.9
      
495.0
      
1.8
      
2.3
  
                                 
Change in plan assets:
                                
Beginning fair value
    
381.4
      
358.2
      
—
      
—
  
Actual (loss)/return on plan assets
    
(61.6
)
    
44.0
      
—
      
—
  
Employer contributions
    
9.0
      
10.7
      
0.1
      
0.5
  
Plan participants' contributions
    
0.3
      
0.3
      
—
      
—
  
Benefits paid
    
(12.4
)
    
(12.4
)
    
(0.1
)
    
(0.5
)
Settlements
    
(24.2
)
    
(17.1
)
    
—
      
—
  
Foreign exchange impact
    
(7.1
)
    
(2.3
)
    
—
      
—
  
Ending fair value
    
285.4
      
381.4
      
—
      
—
  
                                 
Funded status
  
$
(63.5
)
  
$
(113.6
)
  
$
(1.8
)
  
$
(2.3
)
Amounts Recognized in Consolidated Balance Sheet

Amounts recognized in the consolidated balance sheet consist of:

  
Pension Benefits
    
Post-Retirement Benefits
  
(millions of dollars)
  
2022
    
2021
    
2022
    
2021
  
Current liability
  
$
(1.7
)
  
$
(1.4
)
  
$
(0.1
)
  
$
(0.2
)
Non-current liability
    
(61.8
)
    
(112.2
)
    
(1.7
)
    
(2.1
)
Recognized liability
  
$
(63.5
)
  
$
(113.6
)
  
$
(1.8
)
  
$
(2.3
)
Amounts Recognized in Accumulated Other Comprehensive Loss

Amounts recognized in accumulated other comprehensive loss, net of related tax effects, consist of:

  
Pension Benefits
    
Post-Retirement Benefits
  
(millions of dollars)
  
2022
    
2021
    
2022
    
2021
  
Net actuarial (gain) loss
  
$
38.0
    
$
73.2
    
$
(3.8
)
  
$
(3.7
)
Prior service cost
    
0.1
      
0.1
      
—
      
—
  
Amount recognized end of year
  
$
38.1
    
$
73.3
    
$
(3.8
)
  
$
(3.7
)
Change in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income

Changes in the Plan assets and benefit obligations recognized in other comprehensive income:

  
Pension Benefits
    
Post-Retirement Benefits
  
(millions of dollars)
  
2022
    
2021
    
2022
    
2021
  
Current year actuarial gain
  
$
31.2
    
$
36.7
    
$
0.4
    
$
0.1
  
Amortization of actuarial (gain) loss
    
4.0
      
9.0
      
(0.3
)
    
(0.6
)
Total recognized in other comprehensive income
  
$
35.2
    
$
45.7
    
$
0.1
    
$
(0.5
)
Net Periodic Benefit Cost

The components of net periodic benefit costs are as follows:

  
Pension Benefits
    
Post-Retirement Benefits
  
(millions of dollars)
  
2022
    
2021
    
2020
    
2022
    
2021
    
2020
  
Service cost
  
$
6.6
    
$
7.7
    
$
7.7
    
$
—
    
$
0.1
    
$
0.2
  
Interest cost
    
11.0
      
7.9
      
10.5
      
—
      
0.1
      
0.2
  
Expected return on plan assets
    
(21.5
)
    
(22.0
)
    
(20.1
)
    
—
      
—
      
—
  
Recognized net actuarial (gain) loss
    
5.3
      
12.1
      
13.9
      
(0.4
)
    
(0.8
)
    
(0.9
)
Settlement/curtailment (gain) loss
    
3.5
      
3.4
      
6.4
      
—
      
(1.6
)
    
—
  
Net periodic benefit cost
  
$
4.9
    
$
9.1
    
$
18.4
    
$
(0.4
)
  
$
(2.2
)
  
$
(0.5
)
Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost and Benefit Obligation

The weighted average assumptions used to determine net periodic benefit cost in the accounting for the pension benefit plans and other benefit plans for the years ended December 31, 2022, 2021 and 2020 are as follows:

  
Year Ended December 31,
  
   
2022
    
2021
    
2020
  
Discount rate
    
4.30
%
    
2.01
%
    
2.74
%
Expected return on plan assets
    
6.34
%
    
6.28
%
    
6.32
%
Rate of compensation increase
    
2.74
%
    
2.72
%
    
2.72
%
Interest crediting rate
    
2.25
%
    
2.25
%
    
3.75
%


The weighted average assumptions used to determine benefit obligations for the pension benefit plans and other benefit plans at December 31, 2022, 2021 and 2020 are as follows:

  
Year Ended December 31,
  
   
2022
    
2021
    
2020
  
Discount rate
    
4.84
%
    
2.42
%
    
2.01
%
Rate of compensation increase
    
2.76
%
    
2.74
%
    
2.98
%
Weighted Average Asset Allocation Percentages

The Company's pension plan weighted average asset allocation percentages at December 31, 2022 and 2021 by asset category are as follows:

  
December 31,
  
   
2022
    
2021
  
Asset Category
            
Equity securities
    
54.3
%
    
54.2
%
Fixed income securities
    
32.2
%
    
30.6
%
Real estate
    
0.3
%
    
0.3
%
Other
    
13.2
%
    
14.9
%
Total
    
100.0
%
    
100.0
%
Fair Value of Plan Assets

The Company's pension plan fair values at December 31, 2022 and 2021 by asset category are as follows:

  
December 31,
  
(millions of dollars)
  
2022
    
2021
  
Asset Category
            
Equity securities
  
$
155.0
    
$
206.8
  
Fixed income securities
    
91.9
      
116.5
  
Real estate
    
0.8
      
1.0
  
Other
    
37.7
      
57.1
  
Total
  
$
285.4
    
$
381.4
  


The following table presents domestic and foreign pension plan assets information at December 31, 2022, 2021 and 2020 (the measurement date of pension plan assets):

  
U.S. Plans
    
International Plans
  
(millions of dollars)
  
2022
    
2021
    
2020
    
2022
    
2021
    
2020
  
Fair value of plan assets
  
$
226.4
    
$
293.8
    
$
271.6
    
$
59.0
    
$
87.6
    
$
86.6
  
Defined Benefit Pension Plan Assets Measured at Fair Value

The following table summarizes our defined benefit pension plan assets measured at fair value as of December 31, 2022:

 
Quoted Prices in
Active Markets for
Identical Assets
    
Significant
Other Observable
Inputs
    
Significant
Unobservable
Inputs
        
(millions of dollars)
  
(Level 1)
    
(Level 2)
    
(Level 3)
    
Total
  
Pension Assets Fair Value as of December 31, 2022
                        
Equity securities
                        
US equities
  
$
135.7
    
$
—
    
$
—
    
$
135.7
  
Non-US equities
    
19.3
      
—
      
—
      
19.3
  
                                 
Fixed income securities
                                
Corporate debt instruments
    
79.6
      
12.3
      
—
      
91.9
  
                                 
Real estate and other
                                
Real estate
    
—
      
—
      
0.8
      
0.8
  
Other
    
0.3
      
30.6
      
6.8
      
37.7
  
                                 
Total assets
  
$
234.9
    
$
42.9
    
$
7.6
    
$
285.4
  


The following table summarizes our defined benefit pension plan assets measured at fair value as of December 31, 2021:

 
Quoted Prices in
Active Markets for
Identical Assets
    
Significant
Other Observable
Inputs
    
Significant
Unobservable
Inputs
        
(millions of dollars)
  
(Level 1)
    
(Level 2)
    
(Level 3)
    
Total
  
Pension Assets Fair Value as of December 31, 2021
                        
Equity securities
                        
US equities
  
$
182.8
    
$
—
    
$
—
    
$
182.8
  
Non-US equities
    
24.0
      
—
      
—
      
24.0
  
                                 
Fixed income securities
                                
Corporate debt instruments
    
96.4
      
20.1
      
—
      
116.5
  
                                 
Real estate and other
                                
Real estate
    
—
      
—
      
1.0
      
1.0
  
Other
    
0.4
      
51.7
      
5.0
      
57.1
  
                                 
Total assets
  
$
303.6
    
$
71.8
    
$
6.0
    
$
381.4
  
Reconciliation of Changes in Fair Value Measurement of Plan Assets Using Significant Unobservable Inputs

The following is a reconciliation of changes in fair value measurement of plan assets using significant unobservable inputs (Level 3):

(millions of dollars)
      
Beginning balance at December 31, 2020
  
$
8.3
  
Purchases, sales, settlements
    
—
  
Actual return on plan assets still held at reporting date
    
(2.3
)
Foreign exchange impact
    
—
  
Ending balance at December 31, 2021
  
$
6.0
  
Purchases, sales, settlements
    
—
  
Actual return on plan assets still held at reporting date
    
1.8
  
Foreign exchange impact
    
(0.2
)
Ending balance at December 31, 2022
  
$
7.6
  
Estimated Future Benefit Payments

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid:

(millions of dollars)
  
Pension Benefits
    
Other Benefits
  
2023
  
$
22.7
    
$
0.1
  
2024
  
$
22.3
    
$
0.1
  
2025
  
$
23.0
    
$
0.2
  
2026
  
$
23.4
    
$
0.2
  
2027
  
$
24.0
    
$
0.2
  
2028-2032
  
$
120.5
    
$
0.7