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Property (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |  |
Property, gross | $ 1,544.8 | $ 1,540.4 |
Less accumulated depreciation and amortization | (1,039.5) | (961.2) |
Property, net | 505.3 | 579.2 |
Proceeds from the sale of building property | 39.3 | 0.0 | $ 0.0
Gain (Loss) on Sale of Properties | 30.4 |  |
Software and software development costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, gross | 661.1 | 647.2 |
Furniture, fixtures and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, gross | 519.1 | 492.9 |
Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, gross | 232.3 | 225.5 |
Building and building improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, gross | 132.3 | 167.1 |
Land and land improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, gross | $ 0.0 | $ 7.7 |
Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life, minimum | 2 years |  |
Minimum [Member] | Software and software development costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life, minimum | 2 years |  |
Minimum [Member] | Furniture, fixtures and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life, minimum | 2 years |  |
Minimum [Member] | Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life, minimum | 3 years |  |
Minimum [Member] | Building and building improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life, minimum | 1 year |  |
Minimum [Member] | Land and land improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life, minimum | 10 years |  |
Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life, minimum | 20 years |  |
Maximum [Member] | Software and software development costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life, minimum | 4 years |  |
Maximum [Member] | Furniture, fixtures and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life, minimum | 7 years |  |
Maximum [Member] | Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life, minimum | 19 years |  |
Maximum [Member] | Building and building improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life, minimum | 10 years |  |
Maximum [Member] | Land and land improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life, minimum | 20 years |  |

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2443-110228 + Details
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