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Interest Expense (Tables)
 3 Months Ended
Mar. 31, 2015
Interest Expense [Abstract]  
Schedule of interest expense
Details of interest expense are as follows:
 
Three months ended 
 March 31,
 
2015
 
2014
 
(in millions)
Interest on borrowings(1)
$
63.5

 
$
47.9

Fees on financing agreements(1)
1.4

 
3.5

Interest on tax liabilities
0.5

 
1.5

Interest capitalized
(31.5
)
 
(12.9
)
 
$
33.9

 
$
40.0


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(1) 
See Note 12—Financing Agreements for additional information.