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Marketable Securities Held in Trusts (Tables)
9 Months Ended
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale investments
The estimated fair value of the investments in the RCRA Trusts is as follows:
 
September 30,
2016
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Level 1
 
 
 
 
 
 
 
    Cash and cash equivalents
$
27.9

 
$

 
$

 
$
27.9

Level 2
 
 
 
 
 
 
 
    Corporate debt securities
203.5

 

 
(0.4
)
 
203.1

    Municipal bonds
138.1

 
0.1

 
(0.4
)
 
137.8

    U.S. government bonds
258.4

 
0.1

 
(0.1
)
 
258.4

Total
$
627.9

 
$
0.2

 
$
(0.9
)
 
$
627.2

Fair value of available-for-sale debt securities in an unrealized loss position
The following table shows the gross unrealized losses and fair values of the RCRA Trusts' available-for-sale securities that have been in a continuous unrealized loss position deemed to be temporary as of September 30, 2016.
 
September 30,
2016
 
Less than 12 months(a)
 
Fair
Value
 
Gross
Unrealized
Losses
Corporate debt securities
$
135.8

 
$
(0.4
)
Municipal bonds
45.9

 
(0.4
)
U.S. government bonds
218.6

 
(0.1
)
Total
$
400.3

 
$
(0.9
)
(a) Represents the aggregate of the gross unrealized losses that have been in a continuous unrealized loss position as of September 30, 2016.
Schedule of maturity dates for debt securities
The following table summarizes the balance by contractual maturity of the available-for-sale debt securities invested by the RCRA Trusts as of September 30, 2016. Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations before the underlying contracts mature.
 
September 30,
2016
Due in one year or less
$
82.3

Due after one year through five years
151.0

Due after five years through ten years
354.3

Due after ten years
11.7

Total debt securities
$
599.3