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Cash, Cash Equivalents and Restricted Cash (Tables)
 9 Months Ended
Sep. 30, 2018
Cash, Cash Equivalents and Restricted Cash [Abstract]  
Schedule of Cash and Cash Equivalents
The following table summarizes the Company’s cash, cash equivalents and restricted cash as presented on the unaudited condensed consolidated balance sheet to amounts on the condensed consolidated statement of cash flows (in millions):
 
September 30, 2018
 
December 31, 2017
 
 
 
 
Cash and cash equivalents
$
124.9

 
$
208.8

Deposits for financial assurance - current
30.2

 
16.3

Deposits for financial assurance - noncurrent
6.2

 
19.7

Total cash, cash equivalents and restricted cash
$
161.3

 
$
244.8
Restrictions on Cash and Cash Equivalents

The following table provides additional detail regarding the Company’s deposits for financial assurance (in millions):
 
September 30, 2018
 
December 31, 2017
 
Current
 
Long-Term
 
Current
 
Long-Term
NRC license
$
16.3

 
$
—

 
$
16.1

 
$
—

DOE lease
13.7

 
—

 
—

 
13.5

Workers compensation
—

 
5.9

 
—

 
5.9

Other
0.2

 
0.3

 
0.2

 
0.3

Total deposits for financial assurance
$
30.2

 
$
6.2

 
$
16.3

 
$
19.7