|
Fair Value Measurements (Details 2) (USD $)
In Millions, unless otherwise specified
|
Mar. 31, 2015
|
Dec. 31, 2014
|
| Fair value measurement, additional disclosure |
|
|
| Cash collateral deposits held by financial counterparties |
$ 257.4 |
$ 301.0 |
| Cash collateral deposits held by financial counterparties, offset against liabilities |
207.1 |
274.3 |
| Cash collateral deposits held by financial counterparties, not offset |
50.3 |
26.7 |
| Cash collateral received from customers |
32.0 |
46.7 |
| Commodity contracts |
|
|
| Derivative instruments, at their respective fair value positions |
|
|
| Total net assets |
235.0 |
305.5 |
| Total net liabilities |
41.8 |
42.0 |
| Commodity contracts | Other current assets |
|
|
| Derivative instruments, at their respective fair value positions |
|
|
| Total net assets |
221.4 |
294.3 |
| Commodity contracts | Identifiable intangible and other non-current assets |
|
|
| Derivative instruments, at their respective fair value positions |
|
|
| Total net assets |
13.6 |
11.2 |
| Commodity contracts | Accrued expenses and other current liabilities |
|
|
| Derivative instruments, at their respective fair value positions |
|
|
| Total net liabilities |
39.3 |
41.3 |
| Commodity contracts | Other long-term liabilities |
|
|
| Derivative instruments, at their respective fair value positions |
|
|
| Total net liabilities |
2.5 |
0.7 |
| Foreign currency contracts |
|
|
| Derivative instruments, at their respective fair value positions |
|
|
| Total net assets |
12.5 |
9.8 |
| Foreign currency contracts | Other current assets |
|
|
| Derivative instruments, at their respective fair value positions |
|
|
| Total net assets |
11.5 |
9.3 |
| Foreign currency contracts | Identifiable intangible and other non-current assets |
|
|
| Derivative instruments, at their respective fair value positions |
|
|
| Total net assets |
$ 1.0 |
$ 0.5 |