|
Related Parties (Details) (Director [Member], USD $)
In Millions, unless otherwise specified |
9 Months Ended | |
|---|---|---|
|
Sep. 30, 2012
|
Sep. 30, 2011
|
|
| Related Party Transaction [Line Items] | ||
| Related Party Transaction Amount of Assets in Defined Contributions Plans | $ 21.6 | |
| Related Party Transaction Percent of Assets in Defined Contribution Plan Assets | 7.00% | |
|
Trinity [Member]
|
||
| Related Party Transaction [Line Items] | ||
| Related Party Transaction, Amounts of Transaction | 128.3 | |
| Related Party Transaction, Expenses from Transactions with Related Party | 0.2 | 0.2 |
|
Pension Plans, Defined Benefit [Member]
|
||
| Related Party Transaction [Line Items] | ||
| Related Party Transaction, Expenses from Transactions with Related Party | 0.2 | 0.2 |
| Related Party Transaction Amount of Assets Under Management in Defined Benefit Plans | $ 123.9 | |