Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.6
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)