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Guarantees (Tables)
 12 Months Ended
Dec. 31, 2016
Guarantees [Abstract]  
Schedule of outstanding guarantees
The following table shows our outstanding guarantees:
 
 
Total Amounts Committed
 
Expiration
(in millions)
 
at December 31, 2016
 
Less Than 1 Year
 
1 to 3 Years
 
Over 3 Years
Guarantees
 
 
 
 
 
 
 
 
Standby letters of credit (1)
 
$
29.4

 
$
27.9

 
$
1.5

 
$
—

Surety bonds (2)
 
10.9

 
10.3

 
0.6

 
—

Other guarantees (3)
 
7.6

 
0.5

 
—

 
7.1

Total guarantees
 
$
47.9

 
$
38.7

 
$
2.1

 
$
7.1


(1) 
At our request or the request of our subsidiaries, financial institutions have issued standby letters of credit for the benefit of third parties that have extended credit to our subsidiaries. These amounts are not reflected on our balance sheets.

(2) 
Primarily for workers compensation self-insurance programs and obtaining various licenses, permits, and rights-of-way. These amounts are not reflected on our balance sheets.

(3) 
Consists of $7.6 million related to other indemnifications, for which a liability of $7.1 million related to workers compensation coverage was recorded on our balance sheets.