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Employee benefit plans (Tables) | 9 Months Ended
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Sep. 30, 2012
Other postretirement benefits [Member] |
Defined benefit plans | Other postretirement benefits - The components of our net periodic other postretirement benefit cost are presented in the table below.
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2011 |  |  | 2012 |  |  | 2011 |  |  | 2012 |
|  | (In millions) |
Service cost |  | $ | .1 |  |  | $ | .1 |  |  | $ | .2 |  |  | $ | .2 |
Interest cost |  |  | .2 |  |  |  | .1 |  |  |  | .7 |  |  |  | .6 |
Amortization of prior service credit |  |  | (.6 | ) |  |  | (.5 | ) |  |  | (1.7 | ) |  |  | (1.4 | )
Recognized actuarial losses |  |  | — |  |  |  | .1 |  |  |  | — |  |  |  | .1 |
Total |  | $ | (.3 | ) |  | $ | (.2 | ) |  | $ | (.8 | ) |  | $ | (.5 | )
Defined benefit plans [Member] |
Defined benefit plans | Defined benefit plans - The components of our net periodic defined benefit pension cost are presented in the table below.
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2011 |  |  | 2012 |  |  | 2011 |  |  | 2012 |
|  | (In millions) |
Service cost |  | $ | 2.8 |  |  | $ | 2.5 |  |  | $ | 8.3 |  |  | $ | 7.7 |
Interest cost |  |  | 6.9 |  |  |  | 6.2 |  |  |  | 20.5 |  |  |  | 19.1 |
Expected return on plan assets |  |  | (5.8 | ) |  |  | (5.5 | ) |  |  | (17.2 | ) |  |  | (16.5 | )
Amortization of unrecognized: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  | .3 |  |  |  | .4 |  |  |  | 1.1 |  |  |  | 1.2 |
Net transition obligations |  |  | .2 |  |  |  | .1 |  |  |  | .4 |  |  |  | .3 |
Recognized actuarial losses |  |  | 1.9 |  |  |  | 2.3 |  |  |  | 5.6 |  |  |  | 6.9 |
Total |  | $ | 6.3 |  |  | $ | 6.0 |  |  | $ | 18.7 |  |  | $ | 18.7 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration