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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of future minimum rental payments Minimum rental commitments at December 31, 2018 were as follows (in millions of dollars):
Year Ended December 31,
Capital Leases
 
Operating Leases
2019
$
1.7

 
$
6.1

2020
1.4

 
3.7

2021
1.2

 
2.8

2022
1.1

 
2.4

2023
1.0

 
2.2

2024 and thereafter
1.8

 
20.8

Total minimum lease payments
$
8.2

 
$
38.0

 
 
 
 
Less: interest
(1.2
)
 
 
Present value1
$
7.0

 
 
Summary of activities relating to the Company's CARO liabilities The following table summarizes the activity relating to our CARO liabilities (in millions of dollars):
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
Beginning balance
 
$
5.9

 
$
5.5

 
$
4.9

Liabilities settled during the period
 
—

 
—

 
(0.1
)
Accretion expense
 
0.4

 
0.4

 
0.5

Adjustment to accretion expense due to revisions to estimated cash flow and timing of expenditure1
 
—

 
—

 
0.2

Ending balance
 
$
6.3

 
$
5.9

 
$
5.5

_________________________
1. 
The adjustments in 2016 had a de minimis impact on the basic and diluted net income per share for 2016.     
Schedule of changes in environmental contingencies The following table presents the changes in our environmental accrual, which was primarily included in Long-term liabilities (in millions of dollars):
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
Beginning balance
 
$
16.6

 
$
17.2

 
$
18.6

Additional accruals
 
1.7

 
0.3

 
0.1

Less: expenditures
 
(1.4
)
 
(0.9
)
 
(1.5
)
Ending balance
 
$
16.9

 
$
16.6

 
$
17.2