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DERIVATIVE FINANCIAL INSTRUMENTS (Details)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
USD ($)
types
Feb. 19, 2011
years
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
USD ($)
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
USD ($)
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2010
Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2010
Hedge of Bucyrus Stock Price
Not Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2011
Foreign Exchange Contract [Member]
USD ($)
May 19, 2011
Foreign Exchange Contract [Member]
Not Designated as Hedging Instrument [Member]
EUR (€)
Dec. 31, 2011
Fair Value Hedging [Member]
Interest Rate Swap [Member]
Designated as Hedging Instrument [Member]
USD ($)
Jan. 15, 2007
Fair Value Hedging [Member]
Interest Rate Swap [Member]
Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2006
Fair Value Hedging [Member]
Interest Rate Swap [Member]
Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2011
Cash Flow Hedging [Member]
Foreign Exchange Contract [Member]
Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2010
Cash Flow Hedging [Member]
Foreign Exchange Contract [Member]
Designated as Hedging Instrument [Member]
USD ($)
Derivative [Line Items]                                  
Derivatives, Derivative Types 2                                
Variable interest rate The interest rate swap agreement is based on LIBOR yield curves at the reporting date                                
Derivative, Notional Amount                     $ 587.1   $ 400.0   $ 200.0    
Derivative Asset, Fair Value, Gross Asset               40.5 42.2                
Fair value of asset derivatives designated as hedging instruments                                  
Interest rate contract             39.3                    
Amount paid to exit interest rate swap agreement                           (5.4)      
Period of time that currency exchange forward contracts generally mature (in years) 1 year                                
Foreign Currency Cash Flow Hedge Derivative at Fair Value, Net         5.9 3.3                      
Notional amount of foreign currency derivatives classified under cash flow hedge                               526.1  
Unrealized gain on fair value of currency exchange forward cash flow hedge contracts                               5.6  
Payments for (Proceeds from) Derivative Instrument, Investing Activities 16.1   21.1 0           21.0              
Bucyrus stock, percentage of risk mitigated by derivative contracts (as a percent)                   95.00%              
Period of restriction on sale of shares (in years)   1                              
Notional Amount of Foreign Currency Derivative Purchase Contracts                       450.0          
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net                               (5.5) (6.4)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months (3.6)                                
Unrealized net gains (losses) included in Accumulated other comprehensive income                                  
Balance at beginning of period (2.1)   (3.6) (1.0)                          
Additional (losses) gains (2.3)   (2.0) (15.7)                          
Amounts reclassified to earnings 0.8   3.5 13.1                          
Balance at end of period $ (3.6)   $ (2.1) $ (3.6)