Interest Expense Details of interest expense are as follows: | | | | | | | | | | | | | | | | | | Three months ended June 30, | | Six months ended June 30, | | 2015 | | 2014 | | 2015 | | 2014 | | (in millions) | Interest on borrowings(1) | $ | 63.5 |
| | $ | 63.5 |
| | $ | 127.0 |
| | $ | 111.4 |
| Fees on financing agreements(1) | 2.4 |
| | 2.4 |
| | 3.8 |
| | 5.9 |
| Interest on tax liabilities | 0.5 |
| | 0.4 |
| | 1.0 |
| | 1.9 |
| Interest capitalized | (37.4 | ) | | (15.6 | ) | | (68.9 | ) | | (28.5 | ) | | $ | 29.0 |
| | $ | 50.7 |
| | $ | 62.9 |
| | $ | 90.7 |
|
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| | (1) | See Note 12—Financing Agreements for additional information. |
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