Annual report pursuant to Section 13 and 15(d)

Investments (Details)

v2.4.0.8
Investments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Investments [Line Items]      
Amortized cost $ 12.7 $ 144.4  
Gross Unrealized Gains, Available-for-sale Securities 0 0  
Gross Unrealized Losses, Available-for-sale Securities 0 0  
Fair Value Net Carrying Amount 12.7 144.4  
Available-for-sale debt securities [Abstract]      
Due in one year or less, amortized cost 12.7 92.3  
Due after one year through two years, amortized cost   52.1  
Total available-for-sale debt securities, amortized cost 12.7 144.4  
Due in one year or less, fair value (net carrying amount) 12.7 92.3  
Due after one year through two years, fair value (net carrying amount)   52.1  
Total available-for-sale debt securities, fair value (net carrying amount) 12.7 144.4  
Maturity of investments, maximum 2 years    
Sales of available-for-sale securities 35.7 48.9  
Redemptions in available-for-sale securities 116.9 178.8  
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax 0 0.1  
Equity contributions to other existing joint ventures 0.8 0 0
Dividends from its unconsolidated affiliates 0.6 0.3 0.4
Equity loss 1.9 3.8 4.7
Cummins MerCruiser Diesel Marine LLC joint venture [Member]
     
Available-for-sale debt securities [Abstract]      
Equity loss     3.8
Agency Bonds [Member]
     
Schedule of Investments [Line Items]      
Amortized cost   59.2  
Gross Unrealized Gains, Available-for-sale Securities   0  
Gross Unrealized Losses, Available-for-sale Securities   0  
Fair Value Net Carrying Amount   59.2  
Corporate Bonds [Member]
     
Schedule of Investments [Line Items]      
Amortized cost 11.9 66.4  
Gross Unrealized Gains, Available-for-sale Securities 0 0  
Gross Unrealized Losses, Available-for-sale Securities 0 0  
Fair Value Net Carrying Amount 11.9 66.4  
Commercial Paper [Member]
     
Schedule of Investments [Line Items]      
Amortized cost   16.0  
Gross Unrealized Gains, Available-for-sale Securities   0  
Gross Unrealized Losses, Available-for-sale Securities   0  
Fair Value Net Carrying Amount   16.0  
Certificate of Deposit [Member]
     
Schedule of Investments [Line Items]      
Amortized cost   2.0  
Gross Unrealized Gains, Available-for-sale Securities   0  
Gross Unrealized Losses, Available-for-sale Securities   0  
Fair Value Net Carrying Amount   2.0  
U.S. Treasury Bills [Member]
     
Schedule of Investments [Line Items]      
Amortized cost 0.8 0.8  
Gross Unrealized Gains, Available-for-sale Securities 0 0  
Gross Unrealized Losses, Available-for-sale Securities 0 0  
Fair Value Net Carrying Amount $ 0.8 $ 0.8