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Commitments and Contingencies Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of future minimum rental payments
Minimum rental commitments under operating leases at December 31, 2017 were as follows (in millions of dollars):
 
 
Year Ended December 31,
 
 
2018
 
2019
 
2020
 
2021
 
2022
 
2023 and Thereafter
Minimum rental commitments
 
$
5.7

 
$
5.2

 
$
3.1

 
$
2.5

 
$
2.2

 
$
21.0
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,
 
 
2017
 
2016
 
2015
Beginning balance
 
$
5.5

 
$
4.9

 
$
4.8

Liabilities incurred during the period
 
—

 
—

 
—

Liabilities settled during the period
 
—

 
(0.1
)
 
(0.2
)
Accretion expense
 
0.4

 
0.5

 
0.3

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

 
0.2

 
—

Ending balance
 
$
5.9

 
$
5.5

 
$
4.9

__________________________________________ 
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
 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
Beginning balance
 
$
17.2

 
$
18.6

 
$
19.3

Additional accruals
 
0.3

 
0.1

 
1.3

Less: expenditures
 
(0.9
)
 
(1.5
)
 
(2.0
)
Ending balance
 
$
16.6

 
$
17.2

 
$
18.6