|
Benefit Costs Included in Accumulated Other Comprehensive Loss that have not yet Recognized in Net Periodic Pension Cost (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2010
|
|---|---|---|---|
| Defined Benefit Plan Disclosure [Line Items] | |||
| Accumulated other comprehensive loss | $ 276.4 | $ 300.3 | $ 241.3 |
|
Pension Benefits [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Prior service cost, accumulated taxes | 3.5 | 0.9 | |
| Net Actuarial Loss, Accumulated Taxes | 151.5 | 165.6 | |
| Accumulated other comprehensive loss | 268.9 | 290.4 | |
|
Other Benefits [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Prior service cost, accumulated taxes | (0.3) | (0.4) | |
| Net Actuarial Loss, Accumulated Taxes | 4.6 | 6.0 | |
| Accumulated other comprehensive loss | $ 7.5 | $ 9.9 |
| X | ||||||||||
|
- Definition
Tax to related to cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost. No definition available.
|
| X | ||||||||||
|
- Definition
No authoritative reference available. No definition available.
|
| X | ||||||||||
|
- Definition
The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|