|
Debt (Details) (USD $)
|
6 Months Ended | ||
|---|---|---|---|
|
Jun. 30, 2012
|
May 15, 2012
|
Dec. 31, 2011
|
|
| Debt Instrument [Line Items] | |||
| Face amount of note convertible into common shares | $ 1,000 | ||
| Debt | 573,800,000 | 912,800,000 | |
| Fair value | 543,100,000 | 857,000,000 | |
|
Convertible Senior Notes Due 2018 [Member]
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| Debt Instrument [Line Items] | |||
| Debt Instrument, Interest Rate, Stated Percentage | 3.75% | ||
| Debt | 550,000,000 | 550,000,000 | |
| Fair value | 519,200,000 | 489,500,000 | |
|
Convertible Senior Notes Due 2012 [Member]
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|||
| Debt Instrument [Line Items] | |||
| Debt Instrument, Interest Rate, Stated Percentage | 8.00% | ||
| Number of common shares into which notes are convertible (in shares per one thousand dollar note) | 64.3407 | ||
| Debt | 0 | 316,200,000 | 316,200,000 |
| Fair value | 0 | 320,900,000 | |
|
ESSOP Debt [Member]
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|||
| Debt Instrument [Line Items] | |||
| Debt | 20,800,000 | 23,400,000 | |
| Fair value | 20,800,000 | 23,400,000 | |
| Debt, Weighted Average Interest Rate | 3.75% | 3.73% | |
|
Junior Subordinated Debt Due 2033 - 2037 [Member]
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| Debt Instrument [Line Items] | |||
| Debt | 0 | 20,000,000 | |
| Fair value | 0 | 20,000,000 | |
| Debt, Weighted Average Interest Rate | 8.29% | ||
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Other miscellaneous debt [Member]
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| Debt Instrument [Line Items] | |||
| Debt | 2,900,000 | 3,100,000 | |
| Fair value | $ 2,900,000 | $ 3,100,000 |