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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Liabilities Carried at Book Value The fair value of liabilities carried at book value in the financial statements at December 31, 2018 is as follows (in millions):

 
 
December 31, 2018
 
 
Book Value
 
Fair Value
 
Level 1
 
Level 2
 
Level 3
Liabilities:
 
 
 
 
 
 
 
 
 
 
Senior Term Loan (1)
 
$
253.0

 
$
264.6

 
$
—

 
$
264.6

 
$
—

Notes (2)
 
$
105.7

 
$
109.6

 
$
—

 
$
109.6

 
$
—

(1) Book value net of unamortized debt issuance costs of $8.1 million.
(2) Book value net of unamortized debt issuance costs of $2.2 million.