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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 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):
 
December 31, 2019
 
December 31, 2018
Current contract assets
$
3.5

 
$
4.0

Current contract liabilities (deferred revenue)
$
30.0

 
$
56.9

Noncurrent contract liabilities (deferred revenue)
$
9.7

 
$
20.5

    
Changes in contract assets and liabilities during the period are as follows (in millions):
 
Contract Assets
 
Contract Liabilities
Balance as of January 1, 2019
$
4.0

 
$
77.4

Contract assets and liabilities acquired in the Rowan Transaction
8.4

 
5.3

Revenue recognized in advance of right to bill customer
1.3

 
—

Increase due to cash received
—

 
42.9

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

 
(56.3
)
Decrease due to amortization of deferred revenue that was added during the period
—

 
(29.6
)
Decrease due to transfer to receivables during the period
(10.2
)
 
—

Balance as of December 31, 2019
$
3.5

 
$
39.7
Expected Future Amortization of Contract Liabilities Expected future amortization of our contract liabilities and deferred costs recorded as of December 31, 2019 is set forth in the table below (in millions):

 
2020
 
2021
 
2022
 
2023 & Thereafter
 
 Total
Amortization of contract liabilities
$
30.0

 
$
7.8

 
$
1.9

 
$
—

 
$
39.7

Amortization of deferred costs
$
23.2

 
$
5.7

 
$
1.2

 
$
0.4

 
$
30.5