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Leases (Tables)
 3 Months Ended
Mar. 31, 2019
Leases [Abstract]  
Lease, Cost [Table Text Block]
The components of lease expense are as follows (in millions):
 
Three months ended March 31, 2019
Long-term operating lease cost
$
1.1

Short-term operating lease cost
0.2

Sublease income
(0.1
)
Total operating lease cost
$
1.2
Assets and Liabilities, Lessee [Table Text Block]
Supplemental balance sheet information related to the Company's operating leases is as follows (in millions, except lease term and discount rate):
 
March 31, 2019
Operating lease right-of-use assets (included in Other assets on the Condensed Consolidated Balance Sheet)
$
12.3

 
 
Current lease liability (included in Accrued liabilities on the Condensed Consolidated Balance Sheet)
$
3.5

Long-term lease liability (included in Other liabilities on the Condensed Consolidated Balance Sheet)
10.2

Total operating lease liabilities
$
13.7

 
 
Weighted-average remaining lease term (in years)
6.95

 
 
Estimated incremental borrowing cost on a secured basis for similar terms as the underlying lease.
8.25
%
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Maturities of lease liabilities as of March 31, 2019 were as follows (in millions):
Year Ending December 31,
 
2019 (excluding the three months ended March 31, 2019)
$
3.5

2020
3.3

2021
1.5

2022
1.4

2023
1.4

Thereafter
7.2

Total lease payments
18.3

Less imputed interest
(4.6
)
Total
$
13.7