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COMPREHENSIVE INCOME - CHANGES IN AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated other comprehensive income (loss) rollforward [Roll Forward] |  |  |
Beginning Balance | $ 5,133.0 | $ 6,627.9 | $ 8,125.9
Amounts reclassified from accumulated other comprehensive income, net of tax | 5.1 | (30.2) | 7.5
Net (decrease) increase in other comprehensive income | (120.3) | (187.5) | 415.0
Ending Balance | 5,094.9 | 5,133.0 | 6,627.9
Total |  |  |
Accumulated other comprehensive income (loss) rollforward [Roll Forward] |  |  |
Beginning Balance | (478.7) | (291.0) | (705.7)
Net (decrease) increase in other comprehensive income | (121.0) | (187.7) | 414.7
Ending Balance | (599.7) | (478.7) | (291.0)
Total | Excluding Net Investment Hedge [Member] |  |  |
Accumulated other comprehensive income (loss) rollforward [Roll Forward] |  |  |
Beginning Balance | (478.7) | (291.0) |
Other comprehensive (loss) income before reclassifications and tax impact | (141.7) | (111.1) |
Tax benefit (expense) | 15.6 | (46.4) |
Other comprehensive (loss) income, net of tax, before reclassifications | (126.1) | (157.5) |
Amounts reclassified from accumulated other comprehensive income, net of tax | 5.1 | (30.2) |
Net (decrease) increase in other comprehensive income | (121.0) | (187.7) |
Ending Balance | (599.7) | (478.7) | (291.0)
Foreign Currency Translation Gain (Loss) | Excluding Net Investment Hedge [Member] |  |  |
Accumulated other comprehensive income (loss) rollforward [Roll Forward] |  |  |
Beginning Balance | (284.7) | (104.5) |
Other comprehensive (loss) income before reclassifications and tax impact | (87.8) | (160.1) |
Tax benefit (expense) | 4.2 | (20.1) |
Other comprehensive (loss) income, net of tax, before reclassifications | (83.6) | (180.2) |
Amounts reclassified from accumulated other comprehensive income, net of tax | 0.0 | 0.0 |
Net (decrease) increase in other comprehensive income | (83.6) | (180.2) |
Ending Balance | (368.3) | (284.7) | (104.5)
Gain and (Loss) on Cash Flow Hedges | Excluding Net Investment Hedge [Member] |  |  |
Accumulated other comprehensive income (loss) rollforward [Roll Forward] |  |  |
Beginning Balance | 0.6 | (12.6) |
Other comprehensive (loss) income before reclassifications and tax impact | (16.9) | 5.1 |
Tax benefit (expense) | 4.3 | (1.6) |
Other comprehensive (loss) income, net of tax, before reclassifications | (12.6) | 3.5 |
Amounts reclassified from accumulated other comprehensive income, net of tax | 1.4 | 9.7 |
Net (decrease) increase in other comprehensive income | (11.2) | 13.2 |
Ending Balance | (10.6) | 0.6 | (12.6)
Gain and (Loss) on Net Investment Hedges | Excluding Net Investment Hedge [Member] |  |  |
Accumulated other comprehensive income (loss) rollforward [Roll Forward] |  |  |
Beginning Balance | (111.4) | (127.6) |
Other comprehensive (loss) income before reclassifications and tax impact | 17.7 | 36.2 |
Tax benefit (expense) | (7.0) | (20.0) |
Other comprehensive (loss) income, net of tax, before reclassifications | 10.7 | 16.2 |
Amounts reclassified from accumulated other comprehensive income, net of tax | 0.0 | 0.0 |
Net (decrease) increase in other comprehensive income | 10.7 | 16.2 |
Ending Balance | (100.7) | (111.4) | (127.6)
Net Unrealized Holding Gain on Available-for-Sale Securities | Excluding Net Investment Hedge [Member] |  |  |
Accumulated other comprehensive income (loss) rollforward [Roll Forward] |  |  |
Beginning Balance | 0.0 | 44.3 |
Other comprehensive (loss) income before reclassifications and tax impact |  | 0.0 |
Tax benefit (expense) |  | 0.0 |
Other comprehensive (loss) income, net of tax, before reclassifications |  | 0.0 |
Amounts reclassified from accumulated other comprehensive income, net of tax |  | (44.3) |
Net (decrease) increase in other comprehensive income |  | (44.3) |
Ending Balance |  | 0.0 | 44.3
Pension Liability Gain (Loss) | Excluding Net Investment Hedge [Member] |  |  |
Accumulated other comprehensive income (loss) rollforward [Roll Forward] |  |  |
Beginning Balance | (83.2) | (90.6) |
Other comprehensive (loss) income before reclassifications and tax impact | (54.7) | 7.7 |
Tax benefit (expense) | 14.1 | (4.7) |
Other comprehensive (loss) income, net of tax, before reclassifications | (40.6) | 3.0 |
Amounts reclassified from accumulated other comprehensive income, net of tax | 3.7 | 4.4 |
Net (decrease) increase in other comprehensive income | (36.9) | 7.4 |
Ending Balance | $ (120.1) | $ (83.2) | $ (90.6)

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