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Leases | 12 Months Ended
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Dec. 31, 2011
Leases [Abstract] |
Leases [Text Block] | Leases We lease substantially all our office facilities under operating leases and certain equipment under operating and capital leases that expire at various dates. Office leases may include provisions for additional renewal periods at our option. In circumstances where the exercise of the renewal options is reasonably assured at the inception of the lease, the renewal periods are included in the determination of the lease term. Office leases may include scheduled rent increases and concessions, such as rent abatements and landlord / tenant incentives and improvement allowances. Scheduled rent increases are recognized on a straight-line basis over the lease term. Rent abatements and landlord / tenant incentives and improvement allowances are recorded as deferred rent and are amortized to rent expense on a straight-line basis over the lease term. Certain office leases require payment of real estate taxes and other occupancy costs. These costs are not included in rent expense. Leasehold improvements made at inception or during the lease term are amortized over the shorter of the asset life or the lease term, which may include renewal periods where the renewal is reasonably assured. Rent expense for the three years ended December 31, 2011, was (in millions)
| 2011 |  | 2010 |  | 2009
Office rent | $ | 381.6 |  |  | $ | 374.4 |  |  | $ | 396.0 |
Less third party sublease rent | 12.8 |  |  | 16.3 |  |  | 18.9 |
Net office rent | 368.8 |  |  | 358.1 |  |  | 377.1 |
Equipment rent | 42.7 |  |  | 46.4 |  |  | 65.6 |
| $ | 411.5 |  |  | $ | 404.5 |  |  | $ | 442.7 |
Future minimum lease payments under non-cancelable operating and capital leases, reduced by third party sublease rent receivable from existing non-cancelable subleases, are (in millions):
| Operating Leases |  | Capital Leases
| Gross Rent |  | Less Sublease Rent |  | Net Rent |  | Minimum Lease Payments
2012 | $ | 364.9 |  |  | $ | 6.9 |  |  | $ | 358.0 |  |  | $ | 24.9 |
2013 | 298.4 |  |  | 4.8 |  |  | 293.6 |  |  | 16.3 |
2014 | 228.3 |  |  | 4.0 |  |  | 224.3 |  |  | 8.5 |
2015 | 176.4 |  |  | 3.2 |  |  | 173.2 |  |  | 3.7 |
2016 | 129.7 |  |  | 1.0 |  |  | 128.7 |  |  | 2.2 |
Thereafter | 385.4 |  |  | 1.2 |  |  | 384.2 |  |  | 2.2 |
| $ | 1,583.1 |  |  | $ | 21.1 |  |  | $ | 1,562.0 |  |  |
Total minimum lease payments |  |  |  |  |  |  | 57.8 |
Less interest component |  |  |  |  |  |  | 1.9 |
Present value of minimum lease payments |  |  |  |  |  |  | $ | 55.9 |
At December 31, 2011 and 2010, the current and long-term portions of our capital lease obligation were $24.1 million and $31.8 million and $20.3 million and $30.7 million, respectively. Property under capital leases at December 31, 2011 and 2010 was $111.4 million and $94.6 million, respectively. Accumulated amortization of property under capital leases at December 31, 2011 and 2010 was $59.4 million and $46.0 million, respectively. Amortization expense for property under capital leases in 2011, 2010 and 2009 was $25.0 million, $23.0 million and $17.0 million, respectively.

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 1,3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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