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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Net income | $ 73.0 | $ 108.5 | $ 93.0 | $ 399.5
Other comprehensive income: |  |  |  |
Net foreign currency translation adjustment | 12.9 | (194.0) | (2.6) | (19.1)
Net change in postretirement benefit plans, net of tax impacts of $0.0, $340.9, $0.0 and $317.2, respectively | 2.9 | (584.6) | 17.3 | (545.0)
Net change in unrealized gains on investment securities, net of tax impacts of $0.0, $0.5, $0.0 and $7.1, respectively |  | (0.8) |  | (11.7)
Other comprehensive income (loss) | 15.8 | (779.4) | 14.7 | (575.8)
Comprehensive income (loss) | 88.8 | (670.9) | 107.7 | (176.3)
Net change in postretirement benefit plans, net of tax: |  |  |  |
Amortization of prior service costs, net of tax benefit of $0.0, $0.2, $0.0 and $0.7, respectively | 0.2 | 0.4 | 0.6 | 1.2
Amortization of net actuarial loss, net of tax benefit of $0.0, $11.4, $0.0 and $34.6, respectively | 2.7 | 20.1 | 7.8 | 58.9
Prior service cost recognized from curtailment, net of tax benefit of $0.8 |  | 1.4 |  | 1.4
Unrealized change in net actuarial loss, net of tax benefit of $353.3 |  | (606.5) | 8.9 | (606.5)
Net change in postretirement benefit plans, net of tax | 2.9 | (584.6) | 17.3 | (545.0)
Net change in unrealized gains on investment securities, net of tax: |  |  |  |
Unrealized losses arising during period, net of tax benefit of $0.0, $0.5, $0.0 and $1.0, respectively |  | (0.8) |  | (1.6)
Gains realized during the period, net of tax expense of $0.0, $0.0, $0.0 and $6.1, respectively |  |  |  | (10.1)
Net change in unrealized gains on investment securities, net of tax |  | $ (0.8) |  | $ (11.7)

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