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Investments (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule of Investments [Line Items] |  |  |
Maturity of investments, maximum | 2 years |  |
Amortized cost | $ 144.4 | $ 169.7 |
Gross unrealized gains | 0 | 0 |
Gross unrealized losses | 0 | (0.1) |
Fair value (net carrying amount) | 144.4 | 169.6 |
Available-for-sale debt securities [Abstract] |  |  |
Due in one year or less, amortized cost | 92.3 | 76.7 |
Due after one year through two years, amortized cost | 52.1 | 93.0 |
Total available-for-sale debt securities, amortized cost | 144.4 | 169.7 |
Due in one year or less, fair value (net carrying amount) | 92.3 | 76.7 |
Due after one year through two years, fair value (net carrying amount) | 52.1 | 92.9 |
Total available-for-sale debt securities, fair value (net carrying amount) | 144.4 | 169.6 |
Sales of available-for-sale securities | 48.9 | 125.4 |
Redemptions of available-for-sale securities | 178.8 | 71.5 |
Net adjustment to unrealized investment losses on available-for-sale securities | 0.1 | 0 |
Equity contributions to other existing joint ventures |  |  | 12.4
Dividends from its unconsolidated affiliates | 0.3 | 0.4 | 2.4
Equity loss | 3.8 | 4.7 | 3.0
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 | 97.7 |
Gross unrealized gains | 0 | 0 |
Gross unrealized losses | 0 | (0.1) |
Fair value (net carrying amount) | 59.2 | 97.6 |
Corporate Bonds [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized cost | 66.4 | 51.7 |
Gross unrealized gains | 0 | 0 |
Gross unrealized losses | 0 | 0 |
Fair value (net carrying amount) | 66.4 | 51.7 |
Commercial Paper [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized cost | 16.0 | 19.5 |
Gross unrealized gains | 0 | 0 |
Gross unrealized losses | 0 | 0 |
Fair value (net carrying amount) | 16.0 | 19.5 |
Certificate of Deposit [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized cost | 2.0 |  |
Gross unrealized gains | 0 |  |
Gross unrealized losses | 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 | 0 | 0 |
Gross unrealized losses | 0 | 0 |
Fair value (net carrying amount) | $ 0.8 | $ 0.8 |

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