|
Debt (Details) (USD $)
|
6 Months Ended | |
|---|---|---|
|
Jun. 30, 2014
|
Dec. 31, 2013
|
|
| Debt Instrument [Line Items] | ||
| Debt | $ 566,200,000 | $ 569,200,000 |
| Fair value | 706,400,000 | 703,400,000 |
| Face amount of note convertible into common shares | 1,000 | |
|
Convertible Senior Notes Due 2018 [Member]
|
||
| Debt Instrument [Line Items] | ||
| Debt | 550,000,000 | 550,000,000 |
| Fair value | 690,200,000 | 684,100,000 |
| Debt Instrument, Interest Rate, Stated Percentage | 3.75% | |
| Number of common shares into which notes are convertible (in shares per one thousand dollar note) | 64.3407 | |
|
ESSOP Debt [Member]
|
||
| Debt Instrument [Line Items] | ||
| Debt | 15,000,000 | 18,000,000 |
| Fair value | 15,000,000 | 18,000,000 |
| Debt, Weighted Average Interest Rate | 3.66% | 3.69% |
|
Other miscellaneous debt [Member]
|
||
| Debt Instrument [Line Items] | ||
| Debt | 1,100,000 | 1,200,000 |
| Fair value | $ 1,100,000 | $ 1,200,000 |