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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Beginning balance | $ | (287.5 | ) |  | $ | (258.4 | ) |  | $ | (291.9 | ) |  | $ | (262.5 | )
Gain arising during the period | 138.3 |  |  | — |  |  | 138.3 |  |  | — |
Amortization of actuarial (gains) losses, net (a) | 6.1 |  |  | 6.0 |  |  | 12.9 |  |  | 12.0 |
Amortization of prior service costs (a) | 0.5 |  |  | 0.4 |  |  | 0.7 |  |  | 0.8 |
Total reclassifications for the period, before tax | 144.9 |  |  | 6.4 |  |  | 151.9 |  |  | 12.8 |
Income tax (expense) benefit | (53.9 | ) |  | (2.3 | ) |  | (56.5 | ) |  | (4.6 | )
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 91.0 |  |  | 4.1 |  |  | 95.4 |  |  | 8.2 |
Ending balance | $ | (196.5 | ) |  | $ | (254.3 | ) |  | $ | (196.5 | ) |  | $ | (254.3 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 + Details
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