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Revenue from Contracts with Customers (Tables)
 6 Months Ended
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]  
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
The following table summarizes our contract assets and contract liabilities (in millions):
 
June 30, 2020
 
December 31, 2019
Current contract assets
$
6.6

 
$
3.5

Noncurrent contract assets
$
.5

 
$
—

Current contract liabilities (deferred revenue)
$
31.5

 
$
30.0

Noncurrent contract liabilities (deferred revenue)
$
11.2

 
$
9.7

Changes in contract assets and liabilities during the period are as follows (in millions):
 
Contract Assets
 
Contract Liabilities
Balance as of December 31, 2019
$
3.5

 
$
39.7

Revenue recognized in advance of right to bill customer
4.6

 
—

Increase due to cash received
—

 
23.5

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

 
(17.5
)
Decrease due to amortization of deferred revenue that was added during the period
—

 
(3.0
)
Decrease due to transfer to receivables during the period
(1.0
)
 
—

Balance as of June 30, 2020
$
7.1

 
$
42.7
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, 2020 is set forth in the table below (in millions):
 
Remaining 2020
 
2021
 
2022
 
2023 and Thereafter
 
 Total
Amortization of contract liabilities
$
21.6

 
$
17.2

 
$
3.9

 
$
—

 
$
42.7

Amortization of deferred costs
$
15.7

 
$
11.1

 
$
3.2

 
$
.3

 
$
30.3