XML 138 R95.htm IDEA: XBRL DOCUMENT v2.4.0.6
INCOME TAXES (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reconciliation of federal income taxes to the provision for income taxes reported in the income statement      
Statutory federal income tax rate (as a percent) 35.00% 35.00% 35.00%
State income tax rate, net (as a percent) 5.30% 5.10% 105.20%
Plant-related (as a percent) 0.50%   (12.70%)
Unrecognized tax benefits and interest (as a percent) 0.20% (0.20%) 12.70%
Goodwill (as a percent)     486.60%
Investment tax credit - amortization (as a percent) (0.50%) (0.50%) (19.40%)
Federal tax credits (as a percent) (1.90%) (1.80%) 8.20%
Benefits and compensation (as a percent) (2.30%) 1.30% (26.90%)
Other differences, net (as a percent) 0.40% 1.00% 35.90%
Effective income tax rate (as a percent) 36.70% 39.90% 624.60%
Reconciliation of federal income taxes to the provision for income taxes reported in the income statement      
Statutory federal income tax $ 127.7 $ 130.1 $ 4.7
State income taxes, net 19.2 19.1 14.1
Plant-related 1.7 0.1 (1.7)
Unrecognized tax benefits and interest 0.6 (0.9) 1.7
Goodwill     65.2
Investment tax credit - amortization (1.8) (1.8) (2.6)
Federal tax credits (7.1) (6.7) 1.1
Benefits and compensation (8.4) 5.0 (3.6)
Other differences, net 2.0 3.3 4.8
Effective income tax 133.9 148.2 83.7
Reconciliation of the beginning and ending amount of unrecognized tax benefits      
Balance at the beginning of the period 30.4 31.8 22.4
Increase related to tax positions taken in prior years 3.1 9.2 10.2
Decrease related to tax positions taken in prior years (1.6) (10.6) (0.2)
Increase related to tax positions taken in current year 0.9    
Decrease related to tax positions taken in current year     (0.1)
Decrease related to settlements (9.4)   (0.3)
Decrease related to lapse of statutes (1.0)   (0.2)
Balance at the end of the period 22.4 30.4 31.8
Unrecognized Tax Benefits, additional disclosures      
Accrued interest related to unrecognized tax benefits 5.0 6.9  
Accrued penalties related to unrecognized tax benefits 3.6 3.0  
Unrecognized tax benefits related to continuing operations that could affect our effective tax rate, if recognized 5.1    
Unrecognized tax benefits related to discontinued operations that could affect our provision for income taxes, if recognized 9.7    
Reasonable possibility of decrease in unrecognized tax benefits due to settlement of open examinations in multiple taxing jurisdictions related to tax years prior to 2011 $ (13.0)