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Income Taxes Components of Provision for Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Release of Valuation Allowance on Net Federal Deferred Tax Assets in the U.S. $ 337.5      
Net Tax Expense from Amendment of State Tax Returns due to Settlement of Federal Income Tax Audits   1.3    
Current Federal Tax Expense (Benefit)   (3.3) (24.7) 6.0
Current State and Local Tax Expense (Benefit)   1.1 (0.2) 1.4
Current Foreign Tax Expense (Benefit)   10.2 9.9 5.5
Current Income Tax Expense (Benefit)   8.0 (15.0) 12.9
Deferred Federal Income Tax Expense (Benefit)   (347.1) 22.3 (6.0)
Deferred State and Local Income Tax Expense (Benefit)   0 (1.4) 0.5
Deferred Foreign Income Tax Expense (Benefit)   3.9 (4.9) (3.1)
Deferred Income Tax Expense (Benefit)   (343.2) 16.0 (8.6)
Income Tax Expense (Benefit)   $ (335.2) $ 1.0 $ 4.3