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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Financial Assets and Liabilities Accounted at Fair Value
The following table summarizes fair value measurements by level for registered investment companies that were measured at fair value on a recurring basis:
 
Quoted Prices
in Active Markets
for Identical
Assets (Level 1)
June 30, 2018
 
 
Registered investment companies (1)
$
3.8

December 31, 2017
 
 
Registered investment companies (1)
$
3.8

_______________
(1) 
Registered investment companies are classified as available-for-sale securities and are valued using quoted prices in active markets multiplied by the number of shares owned.
Summary of Carrying Value and Estimated Fair Value of Long-Term Debt
The following table summarizes the carrying value and estimated fair value of these financial instruments as of June 30, 2018 and December 31, 2017, respectively:
 
 
 
2018
 
2017
 
Fair Value Hierarchy
 
Carrying
Value
 
Estimated
Fair Value
 
Carrying
Value
 
Estimated
Fair Value
Financial instruments not carried at fair value:
 
 
 
 
 
 
 
 
 
 
 
 
 
Subordinated promissory note receivable
Level 2
 
$
106.2

 
$
111.0

 
$
95.3

 
$
83.3

Long-term debt excluding capitalized
leases and credit facility
Level 2
 
$
2,282.3

 
$
2,335.0

 
$
2,280.6

 
$
2,439.8