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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
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,
 
 
2019
 
2018
 
2017
Beginning balance
 
$
6.3

 
$
5.9

 
$
5.5

Liabilities settled during the period
 
(0.2
)
 
—

 
—

Accretion expense
 
0.5

 
0.4

 
0.4

Adjustment to accretion expense due to revisions to estimated cash flow and timing of expenditure1
 
(0.1
)
 
—

 
—

Ending balance
 
$
6.5

 
$
6.3

 
$
5.9

_________________________
1. 
The adjustments in 2019 had a $0.01 impact on both the basic and diluted net income per share for 2019.     
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,
 
 
2019
 
2018
 
2017
Beginning balance
 
$
16.9

 
$
16.6

 
$
17.2

Additional accruals
 
1.8

 
1.7

 
0.3

Less: expenditures
 
(1.7
)
 
(1.4
)
 
(0.9
)
Ending balance
 
$
17.0

 
$
16.9

 
$
16.6