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Shareholders' Equity - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
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Components of Accumulated Other Comprehensive Income [Abstract] |  |
Accumulated other comprehensive loss | $ (324.7) | $ (286.0)
Translation gain (loss) on net investment hedge, tax | (6.0) | 2.8
Accumulated other comprehensive income, unrealized holding gain (loss) on securities arising during period, tax | 4.1 | 3.8
Accumulated other comprehensive income (loss) resulting from foreign currency translation adjustments |  |
Components of Accumulated Other Comprehensive Income [Abstract] |  |
Accumulated other comprehensive loss | (175.5) | (209.2)
Foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity |  |
Components of Accumulated Other Comprehensive Income [Abstract] |  |
Accumulated other comprehensive loss | (5.7) | 10.0
Intra-entity foreign currency transactions that are of a long-term-investment nature |  |
Components of Accumulated Other Comprehensive Income [Abstract] |  |
Accumulated other comprehensive loss | (129.8) | (75.5)
Accumulated Net Investment Gain (Loss) Attributable to Parent |  |
Components of Accumulated Other Comprehensive Income [Abstract] |  |
Accumulated other comprehensive loss | 18.1 | 17.0
Pension Plan |  |
Components of Accumulated Other Comprehensive Income [Abstract] |  |
Accumulated other comprehensive income, defined benefit plans, tax | (23.4) | (22.3)
Pension Plan | Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |
Components of Accumulated Other Comprehensive Income [Abstract] |  |
Accumulated other comprehensive loss | (35.8) | (32.6)
Other Postretirement Benefit Plan |  |
Components of Accumulated Other Comprehensive Income [Abstract] |  |
Accumulated other comprehensive income, defined benefit plans, tax | 2.2 | 2.4
Other Postretirement Benefit Plan | Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |
Components of Accumulated Other Comprehensive Income [Abstract] |  |
Accumulated other comprehensive loss | $ 4.0 | $ 4.3

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- Definition Tax effect of current period adjustment resulting from gains and losses on foreign currency transactions that are designated as, and are effective as, economic hedges of a net investment in a foreign entity. + References No definition available. + Details
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- Definition Tax effect on gross change in value of the total of unsold securities. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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