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Fixed Assets and Lease Commitments (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Fixed assets |  |  |
Fixed assets, at cost | $ 169.4 | $ 152.2 |
Accumulated depreciation and amortization | (87.9) | (83.1) |
Fixed assets, net | 81.5 | 69.1 |
Future minimum payments for operating leases |  |  |
2013 | 26.9 |  |
2014 | 26.4 |  |
2015 | 24.0 |  |
2016 | 18.3 |  |
2017 | 16.3 |  |
Thereafter | 64.0 |  |
Consolidated rent expense | 30.5 | 29.9 | 23.3
Building and leasehold improvements |  |  |
Fixed assets |  |  |
Fixed assets, at cost | 74.7 | 59.1 |
Office equipment |  |  |
Fixed assets |  |  |
Fixed assets, at cost | 38.9 | 34.1 |
Furniture and fixtures |  |  |
Fixed assets |  |  |
Fixed assets, at cost | 16.3 | 20.6 |
Land and improvements |  |  |
Fixed assets |  |  |
Fixed assets, at cost | 18.1 | 17.9 |
Computer software |  |  |
Fixed assets |  |  |
Fixed assets, at cost | $ 21.4 | $ 20.5 |

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