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Retirement Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Dec. 31, 2009
Muncie Plant [Member]
Mar. 31, 2009
Muncie Plant [Member]
Dec. 31, 2011
Muncie Plant [Member]
Dec. 31, 2013
Muncie Plant [Member]
Dec. 31, 2012
Muncie Plant [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]                      
Recognized net gain due to curtailments           $ 41.9          
Recognized net (gain) loss due to settlements     34.0     14.0          
Recognized net gain (loss) due to settlements and curtailments           27.9          
Employer contribution         23.0   15.0        
Estimated future employer contributions in next fiscal year               0 15 30 40
Estimated future employer contributions in next fiscal year, under contractual obligation       22              
Estimated future employer contributions in year two             15        
Surety bond             35        
Credit balance value waived             8        
Outstanding letters of credit 50.0 26.5         35.0        
Expense for defined contribution and defined benefit pension plans and other post employment defined benefit plans                      
Defined contribution expense 18.9 19.2 16.6                
Defined benefit pension expense 17.5 19.8 33.1                
Other post employment benefit expense 13.5 17.5 (48.4)                
Total $ 49.9 $ 56.5 $ 1.3