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Equity Method Investees (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Equity Method Investment |  |  |
Equity method investments | $ 346.9 | $ 303.2 |
Condensed income statement information |  |  |
Revenues | 6,177.0 | 6,043.4 | 5,970.6
Gross margin | 2,043.5 | 1,897.3 | 1,802.3
Net income | 304.0 | 284.2 | 255.1
Equity in net income of affiliates | 30.7 | 27.6 | 25.4
Condensed balance sheet information |  |  |
Current assets | 1,194.2 | 1,129.7 |
Noncurrent assets | 8,377.8 | 8,139.1 |
Total assets | 9,572.0 | 9,268.8 |
Current liabilities | 888.8 | 866.2 |
Noncurrent liabilities | 6,517.5 | 6,475.5 |
Equity | 2,165.7 | 1,927.1 |
Total liabilities and equity | 9,572.0 | 9,268.8 |
Jacobs Group |  |  |
Equity Method Investment |  |  |
Ownership percentage of Equity Method Investment | 50.00% |  |
The Nix Group |  |  |
Equity Method Investment |  |  |
Ownership percentage of Equity Method Investment | 50.00% |  |
Penske Wynn Ferrari Maserati |  |  |
Equity Method Investment |  |  |
Ownership percentage of Equity Method Investment | 50.00% |  |
Max Cycles |  |  |
Equity Method Investment |  |  |
Ownership percentage of Equity Method Investment | 50.00% |  |
Innovative Media |  |  |
Equity Method Investment |  |  |
Ownership percentage of Equity Method Investment | 45.00% |  |
QEK Global Solutions |  |  |
Equity Method Investment |  |  |
Ownership percentage of Equity Method Investment | 31.00% |  |
Around-The Clock Freightliner |  |  |
Equity Method Investment |  |  |
Ownership percentage of Equity Method Investment | 27.00% |  |
Fleetwash, LLC |  |  |
Equity Method Investment |  |  |
Ownership percentage of Equity Method Investment | 7.00% |  |
National Powersport Auctions |  |  |
Equity Method Investment |  |  |
Ownership percentage of Equity Method Investment | 7.00% |  |
Penske Truck Leasing Co., L.P. ("PTL") |  |  |
Equity Method Investment |  |  |
Equity method investments | 268.8 | 242.8 |
Limited partnership interest (as a percent) | 9.00% |  |
Jacobs Group, The Nix Group, Penske Wynn Ferrari Maserati, Max Cycles, Innovative Media, QEK Global Solutions and Fleetwash, LLC equity method investment |  |  |
Equity Method Investment |  |  |
Equity method investments | $ 78.1 | $ 60.4 |

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