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Supplemental Cash Flow and Noncash Investing Transactions (Tables) | 12 Months Ended
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Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract] |
Supplemental Cash Flow Information |
| 2014 |  | 2013 |  | 2012
Supplemental Cash Flow Information (in millions) |  |  |  |  |
Interest paid (1) | $ | 142.6 |  |  | $ | 148.7 |  |  | $ | 162.3 |
Income taxes paid, net | 18.7 |  |  | 7.4 |  |  | 11.1 |
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(1) | Interest paid consisted of interest on debt obligations, interest rate swaps (net of interest received), and capital leases. The interest expense we capitalized as part of the cost of construction of major assets was immaterial for all periods presented.

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