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Other liabilities
 6 Months Ended
Jun. 30, 2016
Other Liabilities Disclosure [Abstract]  
Other liabilities
Other Liabilities
Other liabilities consisted of the following:
(in millions)
 
June 30, 
 2016
 
December 31, 2015
Interest rate caps
 
$
35.5

 
$
—

Retirement benefits
 
11.7

 
11.2

Unrecognized tax benefits
 
0.3

 
0.3

Other
 
6.9

 
16.3

Total other liabilities
 
$
54.4

 
$
27.8



See note 8, “Debt,” for additional information about the interest rate caps.