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ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of Activity for Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance $ 4,148.3 $ 3,140.4 $ 2,956.2
Ending balance 4,574.3 4,148.3 3,140.4
Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance (154.8) (143.6) (100.1)
Other comprehensive (loss) income before reclassifications           35.7 (1.5) (36.7)
Amounts reclassified from accumulated other comprehensive loss (6.4) (6.6) 0.0
Deferred income tax expense 3.1 (3.1) (1.9)
Ending balance (122.4) (154.8) (143.6)
Unrealized (Loss) Gain on Hedges      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance 12.5 23.6 (13.9)
Other comprehensive (loss) income before reclassifications           (34.8) 27.9 35.1
Amounts reclassified from accumulated other comprehensive loss (19.2) (44.2) 19.1
Deferred income tax expense 13.8 5.2 (13.8)
Ending balance (27.7) 12.5 23.6
Unrealized (Loss) Gain on Available-for-sale Investments      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance 1.7 (5.0) (4.6)
Other comprehensive (loss) income before reclassifications           8.0 7.9 (3.1)
Amounts reclassified from accumulated other comprehensive loss 0.3 0.4 2.9
Deferred income tax expense (1.4) (1.6) (0.2)
Ending balance 8.6 1.7 (5.0)
Unrealized Pension Costs      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance (15.4) (13.5) (14.1)
Other comprehensive (loss) income before reclassifications           (5.5) (3.2) 7.6
Amounts reclassified from accumulated other comprehensive loss 0.9 0.7 (6.7)
Deferred income tax expense 0.4 0.6 (0.3)
Ending balance (19.6) (15.4) (13.5)
Total Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance (156.0) (138.5) (132.7)
Other comprehensive (loss) income before reclassifications           3.4 31.1 2.9
Amounts reclassified from accumulated other comprehensive loss (24.4) (49.7) 15.3
Deferred income tax expense 15.9 1.1 (16.2)
Ending balance $ (161.1) $ (156.0) (138.5)
Impact to retained earnings from adoption of ASU 2016-16 and ASU 2018-02      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance     2.6
Impact to retained earnings from adoption of ASU 2016-16 and ASU 2018-02 | Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance     (4.9)
Impact to retained earnings from adoption of ASU 2016-16 and ASU 2018-02 | Unrealized (Loss) Gain on Hedges      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance     (2.9)
Impact to retained earnings from adoption of ASU 2016-16 and ASU 2018-02 | Unrealized (Loss) Gain on Available-for-sale Investments      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance     0.0
Impact to retained earnings from adoption of ASU 2016-16 and ASU 2018-02 | Unrealized Pension Costs      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance     0.0
Impact to retained earnings from adoption of ASU 2016-16 and ASU 2018-02 | Total Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance     (7.8)
Cumulative Effect, Period of Adoption, Adjusted Balance      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance     2,958.8
Cumulative Effect, Period of Adoption, Adjusted Balance | Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance     (105.0)
Cumulative Effect, Period of Adoption, Adjusted Balance | Unrealized (Loss) Gain on Hedges      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance     (16.8)
Cumulative Effect, Period of Adoption, Adjusted Balance | Unrealized (Loss) Gain on Available-for-sale Investments      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance     (4.6)
Cumulative Effect, Period of Adoption, Adjusted Balance | Unrealized Pension Costs      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance     (14.1)
Cumulative Effect, Period of Adoption, Adjusted Balance | Total Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning balance     $ (140.5)