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Equity Investments in Affiliates (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule of Equity Method Investments |  |  |
Amortization expense during the period | $ 200.0 | $ 97.7 | $ 60.0
Annual amortization expense attributable to current equity method Affiliates for next five years |  |  |
2013 | 41.5 |  |
2014 | 20.0 |  |
2015 | 11.7 |  |
2016 | 8.9 |  |
2017 | 8.9 |  |
Summarized financial information for Affiliates accounted for under the equity method |  |  |
Revenue | 1,005.4 | 581.0 | 619.5
Net income | 783.3 | 387.9 | 444.2
Current assets | 11,957.8 | 8,193.1 |
Noncurrent assets | 34.7 | 29.1 |
Current liabilities | 1,361.5 | 1,022.7 |
Noncurrent liabilities and Non-controlling interest | 9,857.6 | 6,754.3 |
Undistributed earnings from equity method investments | 87.0 |  |
Blue Mountain Capital Management |  |  |
Schedule of Equity Method Investments |  |  |
Purchase price allocated to acquired client relationship | 131.7 |  |
Period of consideration paid | 15 years |  |
Acquired client relationships under equity method investments |  |  |
Schedule of Equity Method Investments |  |  |
Weighted average life | 9 years |  |
Amortization expense during the period | $ 36.9 | $ 32.9 |

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