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Revenue Recognition and Contracts with Customers (Tables)
 6 Months Ended
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]  
Revenue from External Customers by Geographic Areas
The following table presents revenue from SWU and uranium sales disaggregated by geographical region based on the billing addresses of customers (in millions):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2018
 
2017
 
2018
 
2017
United States
$
32.9

 
$
10.9

 
$
54.0

 
$
11.1

Asia
—

 
27.0

 
0.1

 
27.6

Other
—

 
—

 
0.1

 
—

Revenue - SWU and uranium
$
32.9

 
$
37.9

 
$
54.2

 
$
38.7
Contract with Customer, Asset and Liability
The following table represents changes in our contract assets and contract liabilities balances (in millions):
 
 
June 30,
2018
 
January 1, 2018
 
Year-To-Date Change
Contract assets
 
 
 
 
 
 
Accounts receivable:
 
 
 
 
 
 
Billed
 
$
27.9

 
$
60.2

 
$
(32.3
)
Unbilled contract revenue
 
—

 
0.1

 
(0.1
)
Accounts receivable
 
$
27.9

 
$
60.3

 
$
(32.4
)
 
 
 
 
 
 
 
Deferred costs associated with deferred revenue
 
$
130.2

 
$
122.3

 
$
7.9

 
 
 
 
 
 
 
Contract liabilities
 
 
 
 
 
 
Deferred revenue and advances from customers - current:
 
 
 
 
 
 
Deferred revenue
 
$
193.1

 
$
172.5

 
$
20.6

Advances from customers
 
1.9

 
19.3

 
(17.4
)
Deferred revenue and advances from customers - current
 
$
195.0

 
$
191.8

 
$
3.2

 
 
 
 
 
 
 
Advances from customers - noncurrent
 
$
14.5

 
$
—

 
$
14.5


Deferred cost and deferred revenue activity in the six months ended June 30, 2018, follows (in millions):
 
Deferred Sales in the Period
 
Previously Deferred Sales Recognized in the Period
 
Year-To-Date Change
Deferred costs associated with deferred revenue
$
10.6

 
$
(2.7
)
 
$
7.9

Deferred revenue
23.3

 
(2.7
)
 
20.6