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Acquisition of Business (Pro-forma Information) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |  |
Total Revenues | $ 1,194.9 | $ 1,044.4 | $ 3,375.2 | $ 3,080.3
Total Expenses | 1,044.4 | 966.6 | 3,065.7 | 2,995.8
Income from Continuing Operations before Income Taxes | $ 150.5 | $ 77.8 | $ 309.5 | $ 84.5
Net Income Per Unrestricted Share, basic | $ 2.28 | $ 0.82 | $ 4.26 | $ 0.85
Net Income Per Unrestricted Share, diluted | $ 2.26 | $ 0.82 | $ 4.23 | $ 0.85
Infinity [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net Income | $ 147.5 | $ 53.0 | $ 275.5 | $ 54.8

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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