|
Fair Value of Pension Assets (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2011
|
|---|---|
| Defined Benefit Plan Disclosure [Line Items] | |
| Hedge funds, minimum number of days notice prior to redemption | 30 days |
| Hedge funds, maximum number of days notice prior to redemption | 90 days |
|
Private Equity
|
|
| Defined Benefit Plan Disclosure [Line Items] | |
| Commitments related to investments | 23.9 |
|
Real Assets
|
|
| Defined Benefit Plan Disclosure [Line Items] | |
| Commitments related to investments | 4.1 |
| X | ||||||||||
|
- Definition
Redemption Notice Period, Lower Limit No definition available.
|
| X | ||||||||||
|
- Definition
Redemption Notice Period Upper Limit No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|