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Revenue from Contracts with Customers (Tables)
 6 Months Ended
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]  
Contract with Customer, Asset and Liability [Table Text Block]
The following table summarizes our contract assets and contract liabilities (in millions):
 
June 30, 2019
 
December 31, 2018
Current contract assets
$
12.8

 
$
4.0

Current contract liabilities (deferred revenue)
$
46.2

 
$
56.9

Noncurrent contract liabilities (deferred revenue)
$
14.8

 
$
20.5

Significant changes in contract assets and liabilities during the period are as follows (in millions):
 
Contract Assets
 
Contract Liabilities
Balance as of December 31, 2018
$
4.0

 
$
77.4

Contract assets acquired and liabilities assumed in the Rowan Transaction
8.4

 
5.3

Revenue recognized in advance of right to bill customer
2.3

 
—

Increase due to cash received
—

 
34.3

Decrease due to amortization of deferred revenue that was included in the beginning contract liability balance
—

 
(40.2
)
Decrease due to amortization of deferred revenue that was added during the period
—

 
(15.8
)
Decrease due to transfer to receivables during the period
(1.9
)
 
—

Balance as of June 30, 2019
$
12.8

 
$
61.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Expected future amortization of our contract liabilities and deferred costs recorded as of June 30, 2019 is set forth in the table below (in millions):
 
Remaining 2019
 
2020
 
2021
 
2022 and Thereafter
 
 Total
Amortization of contract liabilities
$
39.0

 
$
11.7

 
$
7.6

 
$
2.7

 
$
61.0

Amortization of deferred costs
$
39.7

 
$
13.3

 
$
2.8

 
$
1.4

 
$
57.2