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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2017
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]  
Financial instruments measured at fair value on a recurring basis
The following tables present financial instruments measured at fair value on a recurring basis:
 
 
March 31, 2017
(in millions)
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets at Fair Value:
 
 
 
 
 
 
 
 
Marketable securities:
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
19.9

 
$

 
$

 
$
19.9

Mutual funds
 
66.8

 

 

 
66.8

Equity securities
 
0.1

 

 

 
0.1

Asset-backed securities
 

 
0.3

 

 
0.3

Total Marketable Securities
 
86.8

 
0.3

 

 
87.1

Equity investments
 
19.4

 

 

 
19.4

Total Assets at Fair Value
 
$
106.2

 
$
0.3

 
$

 
$
106.5


Fair value of Debt Instruments
At March 31, 2017, the fair values were as follows:
(in millions)
Fair Value
$750.0 million fixed rate notes due September 2022, stated rate of 3.00% 
$
766.2

$750.0 million fixed rate notes due March 2025, stated rate of 3.00%
751.2

$750.0 million fixed rates notes due September 2043, stated rate of 5.30%
900.1