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Revenue from Contracts with Customers (Tables)
 9 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
Contract Assets and Contract Liabilities
The following table summarizes our contract assets and contract liabilities (in millions):
 September 30, 2019 December 31, 2018
Current contract assets$10.7  $4.0  
Current contract liabilities (deferred revenue)$24.6  $56.9  
Noncurrent contract liabilities (deferred revenue)$11.7  $20.5  

Significant changes in contract assets and liabilities during the period are as follows (in millions):
 Contract AssetsContract Liabilities
Balance as of December 31, 2018$4.0  $77.4  
Contract assets acquired and liabilities assumed in the Rowan Transaction8.4  5.3  
Revenue recognized in advance of right to bill customer0.3  —  
Increase due to cash received—  29.4  
Decrease due to amortization of deferred revenue that was included in the beginning contract liability balance—  (52.1) 
Decrease due to amortization of deferred revenue that was added during the period—  (23.7) 
Decrease due to transfer to receivables during the period(2.0) —  
Balance as of September 30, 2019$10.7  $36.3  
Expected Future Amortization of Contract Liabilities Expected future amortization of our contract liabilities and deferred costs recorded as of September 30, 2019 is set forth in the table below (in millions):
 Remaining 2019202020212022 and Thereafter Total
Amortization of contract liabilities$12.1  $12.9  $7.2  $4.1  $36.3  
Amortization of deferred costs  $12.1  $15.9  $3.3  $1.4  $32.7