Annual report pursuant to Section 13 and 15(d)

Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss) (Details)

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Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Postretirement Benefit Liability [Member]
Dec. 31, 2010
Postretirement Benefit Liability [Member]
Dec. 31, 2009
Postretirement Benefit Liability [Member]
Dec. 31, 2008
Postretirement Benefit Liability [Member]
Dec. 31, 2011
Foreign Currency Translation Adjustment [Member]
Dec. 31, 2010
Foreign Currency Translation Adjustment [Member]
Dec. 31, 2009
Foreign Currency Translation Adjustment [Member]
Dec. 31, 2008
Foreign Currency Translation Adjustment [Member]
Dec. 31, 2011
Unrealized Gain (Loss) On Derivatives [Member]
Dec. 31, 2010
Unrealized Gain (Loss) On Derivatives [Member]
Dec. 31, 2009
Unrealized Gain (Loss) On Derivatives [Member]
Dec. 31, 2008
Unrealized Gain (Loss) On Derivatives [Member]
Dec. 31, 2011
Accumulated Net Unrealized Investment Gain (Loss) On Securities [Member]
Dec. 31, 2010
Accumulated Net Unrealized Investment Gain (Loss) On Securities [Member]
Dec. 31, 2009
Accumulated Net Unrealized Investment Gain (Loss) On Securities [Member]
Dec. 31, 2008
Accumulated Net Unrealized Investment Gain (Loss) On Securities [Member]
Pre-tax Amount $ (299.2) $ (71.3) $ (240.0) $ (615.9) $ (452.0) $ (451.9)   $ 312.5 $ 329.9 $ 163.1   $ 1.7 $ 3.9 $ 5.7   $ 2.5 $ 46.9 $ 43.1  
Tax Benefit (Provision) 206.6 117.2 117.4 207.0 146.9 132.8     (15.2)     (0.5) (1.2) (1.7)   0.1 (13.3) (13.7)  
After-tax Amount (92.6) 45.9 (122.6) (408.9) (305.1) (319.1) (343.3) 312.5 314.7 163.1 (68.6) 1.2 2.7 4.0 19.1 2.6 33.6 29.4 (0.1)
Unrealized net gain on derivative financial instruments, After-tax $ (1.5) $ (1.3) $ (15.1)