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Other Expense, Net (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | [1],[2] | Sep. 30, 2017 | [1],[2] | Jun. 30, 2017 | [1],[2] | Mar. 31, 2017 | [1],[2] | Dec. 31, 2016 | [1],[2] | Sep. 30, 2016 | [1],[2] | Jun. 30, 2016 | [1],[2] | Mar. 31, 2016 | [1],[2] | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Nonoperating Income (Expense) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net losses on sales of businesses |  |  |  |  |  |  |  |  | $ (24.1) | $ (41.4) | $ (50.0)
Other |  |  |  |  |  |  |  |  | (2.1) | 1.1 | 0.4
Total other expense, net | $ (1.7) | $ (9.9) | $ (15.4) | $ 0.8 | $ (26.8) | $ 5.3 | $ 0.4 | $ (19.2) | $ (26.2) | $ (40.3) | $ (49.6)
[1] | As part of the adoption of FASB ASU 2017-07, we have reclassified a portion of postretirement costs from salaries and related expenses to other income (expense), net.
[2] | The three months ended June 30 and September 30, 2017 included pre-tax net losses of $13.1 and $8.7, respectively, on sales of businesses. The three months ended March 31 and December 31, 2016 included pre-tax net losses of $16.3 and $25.3, respectively, on sales of businesses.

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- Definition Amount of income related to nonoperating activities, classified as other. + 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 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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