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Intangible Assets - Accumulated Impairment, Changes in Goodwill and Other Indefinite-Lived Intangibles (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2012
Intangible Assets |  |  |  |
Goodwill, Accumulated impairment loss |  |  |  | $ 606.3
Other indefinite-lived intangible assets, Accumulated impairment loss |  |  |  | $ 37.1
Summary of the changes in the carrying amount of goodwill and other indefinite-lived intangible assets |  |  |  |
Goodwill, Beginning balance | $ 1,660.5 | $ 1,291.2 |  |
Goodwill, Additions | 144.1 | 324.8 |  |
Goodwill, Disposals | (13.8) | (4.5) |  |
Goodwill, Foreign currency translation | (38.8) | 49.0 |  |
Goodwill, Ending balance | 1,752.0 | 1,660.5 | $ 1,291.2 |
Other indefinite-lived intangible assets, Beginning Balance | 474.0 | 420.1 |  |
Other indefinite-lived intangible assets, Additions | 29.8 | 40.8 |  |
Other indefinite-lived intangible assets, Disposals | (0.5) | (1.7) |  |
Other indefinite-lived intangible assets, Impairment | (5.8) | 0.0 | 0.0 |
Other indefinite-lived intangible assets, Foreign currency translation | (11.3) | 14.8 |  |
Other indefinite-lived intangible assets, Ending Balance | $ 486.2 | $ 474.0 | $ 420.1 |

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- Definition The accumulated impairment losses related to indefinite-lived intangible assets other than goodwill as of the balance sheet date. + References No definition available. + Details
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