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Other Liabilties (Tables)
 6 Months Ended
Jun. 30, 2017
Other Liabilities Disclosure [Abstract]  
Other Noncurrent Liabilities
Other liabilities consisted of the following:
(in millions)
 
June 30, 
 2017
 
December 31,
2016
Retirement benefits
 
$
12.3

 
$
10.9

Unrecognized tax benefits
 
5.9

 
4.8

Interest rate caps
 
2.5

 
6.1

Contingent consideration
 
0.5

 
1.5

Other
 
8.7

 
7.4

Total other liabilities
 
$
29.9

 
$
30.7