|
Fair Value of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified |
9 Months Ended | 12 Months Ended |
|---|---|---|
|
Sep. 30, 2013
|
Dec. 31, 2012
|
|
| DTA bonds [Abstract] | ||
| Fair value of the outstanding cross-currency swap | $ 3.1 | |
|
DTA Bond [Member]
|
||
| DTA bonds [Abstract] | ||
| Carrying value | 43.2 | 43.2 |
| Fair value | 43.4 | 43.4 |
|
Unsecured Debt [Member]
|
||
| DTA bonds [Abstract] | ||
| Carrying value | 100.0 | 100.0 |
| Fair value | 105.8 | 110.5 |
|
Mutual funds [Member]
|
||
| Investments in Available-for-sale Securities [Line Items] | ||
| Cost | 3.3 | 4.3 |
| Gross Unrealized Gains | 1.2 | 1.0 |
| Fair Value | $ 4.5 | $ 5.3 |