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Earnings Per Share - Schedule of Reconciliation of the Numerator and Denominator used in the Calculation of Basic and Diluted Earnings per Share (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Numerator |  |  |  |  |  |  |  |  |  |  |
Net income (controlling interest) | $ 150.3 | $ 109.0 | $ 128.7 | $ 128.0 | $ 172.6 | $ 103.2 | $ 99.1 | $ 77.2 | $ 516.0 | $ 452.1 | $ 360.5
Interest expense on convertible securities, net of taxes |  |  |  |  |  |  |  |  | 15.3 | 15.2 | 10.5
Net income (controlling interest), as adjusted |  |  |  |  |  |  |  |  | $ 531.3 | $ 467.3 | $ 371.0
Denominator |  |  |  |  |  |  |  |  |  |  |
Average shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  | 54.3 | 55.0 | 53.1
Effect of dilutive instruments: |  |  |  |  |  |  |  |  |  |  |
Stock options and other awards (in shares) |  |  |  |  |  |  |  |  | 0.7 | 1.2 | 1.3
Forward sale (in shares) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.3
Junior convertible securities (in shares) |  |  |  |  |  |  |  |  | 2.2 | 2.2 | 2.0
Average shares outstanding - diluted (in shares) |  |  |  |  |  |  |  |  | 57.2 | 58.4 | 56.7

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- Definition Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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