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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of Financial Instruments Recorded at Fair Value
Financial Instruments Recorded at Fair Value (in Millions)
 
March 31, 2017
 
December 31, 2016
 
Level 1
 
Level 2
 
Level 3
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash and cash equivalents
$
151.7

 
$
—

 
$
—

 
$
151.7

 
$
260.7

 
$
—

 
$
—

 
$
260.7

Deferred compensation asset (a)
1.2

 
—

 
—

 
1.2

 
1.1

 
—

 
—

 
1.1

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Liabilities:
 
 
 

 
 
 
 

 
 
 
 

 
 
 
 

Deferred compensation obligation (a)
1.2

 
—

 
—

 
1.2

 
1.1

 
—

 
—

 
1.1


 
(a)
The deferred compensation obligation represents the balance of deferred compensation plus net investment earnings. The deferred compensation plan is funded through a rabbi trust. Trust funds are invested in mutual funds for which unit prices are quoted in active markets and are classified within Level 1 of the valuation hierarchy.