Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details)

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INCOME TAXES - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Beginning balance (January 1) $ 35.0 $ 32.5
Increases related to prior year tax positions 2.0 0.6
Decreases related to prior year tax positions (15.2) (5.6)
Increases related to current year tax positions 5.0 13.1
Decreases related to settlements (0.5) (0.3)
Expiration of the statute of limitations for the assessment of taxes (3.5) (5.8)
Currency translation adjustment (0.5) 0.5
Ending balance (December 31) $ 22.3 $ 35.0