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Commitments and Contingencies Minimum Lease Payments (Tables)
6 Months Ended
Jun. 30, 2019
Leases [Abstract]  
Schedule of Future Minimum Rental Payments Including Imputed Interest [Table Text Block]
As of June 30, 2019, minimum future payments, including imputed interest, for long-term operating leases under the scope of ASC 842 are as follows:
Year
Amount
 
(in millions)
2019
$
12.4

2020
$
21.1

2021
$
19.4

2022
$
14.9

2023
$
9.4

After 2023
$
0.5

Less: Interest(1)
$
(11.0
)
Present value of lease liabilities(2)
$
66.7

 ____________________________
(1) 
Calculated using the estimated or stated interest rate for each lease.
(2) 
Of the total present value of lease liabilities, $18.8 million was recorded in "Current operating lease liabilities" and $47.9 million was recorded in "Operating lease liabilities" on the Condensed Consolidated Balance Sheets.
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
As of December 31, 2018, minimum future contractual payments for long-term operating leases under the scope of ASC 840 are as follows:
Year
Amount
 
(in millions)
2019
$
17.4

2020
$
13.8

2021
$
9.1

2022
$
7.4

2023
$
4.5

After 2023
$