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Acuumlated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance | $ (287.5) | $ (258.4) | $ (291.9) | $ (262.5)
Gain arising during the period | 138.3 | 0 | 138.3 | 0
Amortization of actuarial (gains) losses, net (Note 11) | 6.1 | 6.0 | 12.9 | 12.0
Amortization of prior service costs (Note 11) | 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 related to items of other comprehensive income | (53.9) | (2.3) | (56.5) | (4.6)
Other comprehensive income, net of tax | 91.0 | 4.1 | 95.4 | 8.2
Amounts reclassified from accumulated other comprehensice income (loss), net of tax | 91.0 | 4.1 | 95.4 | 8.2
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance | (196.5) | (254.3) | (196.5) | (254.3)
Other comprehensive income, before tax | $ 144.9 | $ 6.4 | $ 151.9 | $ 12.8

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