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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss | $ (1,806.2) | $ (1,598.2) | $ (1,657.1) | $ (1,061.6)
Other Comprehensive Income (Loss), Before Tax | (215.3) | 64.1 | (622.5) |
Other Comprehensive Income (Loss), Tax | 0.1 | (6.4) | 21.8 |
Net Gain (Loss) on Marketable Securities Held in Trust, After Reclassification and Tax | 12.8 | 10.9 | 4.6 |
Other Comprehensive Income (Loss), Net of Tax | (215.2) | 57.7 | (600.7) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 7.2 | 1.2 | 5.2 |
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss | 18.9 | 6.1 | (4.8) | (9.4)
Net Unrealized Holding Gain (Loss) on Marketable Securities Held in Trust, Before Tax | 16.6 | 14.0 | 4.8 |
Net Gain (Loss) on Marketable Securities Held in Trust, Tax | (3.8) | (3.1) | (0.2) |
Net Gain (Loss) on Marketable Securities Held in Trust, After Reclassification and Tax | 12.8 | 10.9 | 4.6 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 0.0 | 0.0 | 0.0 |
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss | 3.7 | 2.1 | 0.4 | (1.8)
Net Gain (Loss) on Interest Rate Swaps Qualifying as Hedge, After Reclassification, Before Tax | 2.0 | 2.2 | 2.3 |
Gain (Loss) on Interest Rate Swaps Qualifying as Hedge, Tax | (0.4) | (0.5) | (0.1) |
Net Gain (Loss) on Interest Rate Swaps Qualifying as Hedge, After Reclassification and Tax | 1.6 | 1.7 | 2.2 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 0.0 | 0.0 | 0.0 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss | (109.7) | (129.6) | (105.3) | (94.7)
Net Actuarial Gain (Loss), After Reclassification, Before Tax | 12.2 | (26.2) | (8.2) |
Other Comprehensive Income (Loss), Tax | 7.7 | 1.9 | (2.4) |
Net Actuarial Gain (Loss), After Reclassification and Tax | 19.9 | (24.3) | (10.6) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 0.0 | 0.0 | 0.0 |
Accumulated Foreign Currency Adjustment Attributable to Parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss | (1,719.1) | (1,476.8) | (1,547.4) | $ (955.7)
Foreign Currency Translation Gain (Loss), Before Tax | (246.1) | 74.1 | (621.4) |
Foreign Currency Translation Adjustment, Tax (Expense) Benefit | (3.4) | (4.7) | 24.5 |
Foreign Currency Translation Gain (Loss), Net of Tax | (249.5) | 69.4 | (596.9) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | $ 7.2 | $ 1.2 | $ 5.2 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 + Details
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