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Earnings Per Share - 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, 2017 | [1] | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Numerator |  |  |  |  |  |  |  |  |  |  |
Net income (controlling interest) | $ 315.4 | $ 125.4 | $ 126.3 | $ 122.5 | $ 150.2 | $ 110.2 | $ 108.3 | $ 104.0 | $ 689.5 | $ 472.8 | $ 509.5
Interest expense on convertible securities, net of taxes |  |  |  |  |  |  |  |  | 15.5 | 15.5 | 15.3
Net income (controlling interest), as adjusted |  |  |  |  |  |  |  |  | $ 705.0 | $ 488.3 | $ 524.8
Denominator |  |  |  |  |  |  |  |  |  |  |
Average shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  | 56.0 | 54.2 | 54.3
Effect of dilutive instruments: |  |  |  |  |  |  |  |  |  |  |
Stock options and restricted stock units (in shares) |  |  |  |  |  |  |  |  | 0.4 | 0.6 | 0.7
Junior convertible securities (in shares) |  |  |  |  |  |  |  |  | 2.2 | 2.2 | 2.2
Average shares outstanding - diluted (in shares) |  |  |  |  |  |  |  |  | 58.6 | 57.0 | 57.2
[1] | In the fourth quarter of 2017, the Company recorded a provisional one-time net benefit from changes in U.S tax laws (see Note 22) and an expense associated with the impairment of one of its Affiliates accounted for under the equity method (see Note 13).

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: 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(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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