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Foreign Operations (Tables) | 12 Months Ended
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Dec. 31, 2014
Concentration Risks, Types, No Concentration Percentage [Abstract] |
Foreign operations data | The following table shows our domestic and foreign revenues and identifiable assets for the years ending or as of December 31 (in millions):
| 2014 |  | 2013 |  | 2012
Revenues |  |  |  |  |
Foreign | $ | 346.2 |  |  | $ | 332.1 |  |  | $ | 279.8 |
United States | 1,104.8 |  |  | 988.9 |  |  | 963.4 |
| $ | 1,451.0 |  |  | $ | 1,321.0 |  |  | $ | 1,243.2 |
Identifiable Assets |  |  |  |  |
Foreign | $ | 2,133.9 |  |  | $ | 2,200.1 |  |  | $ | 1,897.9 |
United States | 4,803.6 |  |  | 4,349.5 |  |  | 4,157.5 |
| $ | 6,937.5 |  |  | $ | 6,549.6 |  |  | $ | 6,055.4 |

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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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