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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
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
)