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Other Assets (Tables)
6 Months Ended
Jun. 30, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other assets
 
(in millions)
 
June 30, 2014
 
December 31, 2013
Investments in affiliated companies
 
$
57.1

 
$
92.4

Deferred financing fees
 
30.0

 
29.7

Deposits
 
6.9

 
15.8

Other
 
15.7

 
0.7

Total other assets
 
$
109.7

 
$
138.6