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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Financial Assets and Liabilities Accounted at Fair Value
The following table summarizes fair value measurements by level for cash equivalents and registered investment companies that were measured at fair value on a recurring basis:
 
Quoted Prices
in Active Markets
for Identical
Assets (Level 1)
March 31, 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 March 31, 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
 
$
95.8

 
$
84.8

 
$
95.3

 
$
83.3

Total debt excluding capitalized leases and
credit facility
Level 2
 
$
2,281.4

 
$
2,386.9

 
$
2,280.6

 
$
2,439.8