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Schedule of Changes in Unrecognized Income Tax Benefits (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward      
Beginning balance $ 29.2 $ 29.7 $ 17.1
Increases in prior period tax positions 0.1 0.2 1.3
Decreases in prior period tax positions (5.8) (0.3) (1.3)
Increases in current period tax positions 60.4 1.2 0.1
Uncertain tax positions assumed in Ladish acquisition 0 0 14.5
Expiration of the statute of limitations (0.7) (2.0) (1.8)
Settlements (8.6) (0.4) (0.7)
Interest and penalties, net (1.8) 0.8 0.5
Ending balance 72.8 29.2 29.7
unrecognized tax benefit [Line Items]      
Income tax penalties and interest accrued 4.7    
Increases in current period tax positions 60.4 1.2 0.1
Unrecognized tax benefits that would impact effective tax rate 10    
Unrecognized tax benefits that will be recognized within 12 months of year end 0.2    
Temporary difference [Member]
      
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward      
Increases in current period tax positions 59.4    
unrecognized tax benefit [Line Items]      
Increases in current period tax positions $ 59.4