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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - New Accounting Standards (Narrative) (Details) - USD ($) $ in Millions | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Concentration Risk [Line Items] |  |  |
Accumulated other comprehensive loss |  | $ (138.5) | $ (132.7)
Retained earnings |  | 2,694.7 | 1,962.1
Other assets |  | 33.6 | 108.9
Other long-term liabilities |  | 150.0 | 147.1
Deferred income taxes |  | $ 174.0 | 167.1
Accounting Standards Update 2016-16 |  |  |
Concentration Risk [Line Items] |  |  |
Retained earnings |  |  | 2.6
Deferred tax liabilities |  |  | 49.1
Other assets |  |  | (50.3)
Other long-term liabilities |  |  | (52.9)
Deferred income taxes |  |  | (46.5)
Accounting Standards Update 2017-12 |  |  |
Concentration Risk [Line Items] |  |  |
Accumulated other comprehensive loss |  |  | (7.8)
Retained earnings |  |  | $ 7.8
Minimum | Scenario, Forecast | Accounting Standards Update 2016-02 |  |  |
Concentration Risk [Line Items] |  |  |
Right-of-use asset | $ 55.0 |  |
Operating lease liability | 55.0 |  |
Maximum | Scenario, Forecast | Accounting Standards Update 2016-02 |  |  |
Concentration Risk [Line Items] |  |  |
Right-of-use asset | 65.0 |  |
Operating lease liability | $ 65.0 |  |

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