DEBT (Short-term borrowings and current portion of long-term debt) (Table) (Details) - USD ($)
$ in Millions

3 Months Ended

Mar. 31, 2019

Dec. 31, 2018

Short-term Debt [Line Items]

Amount Outstanding Letters Of Credit

$ 72.2

Total short-term borrowings and current portion of long-term debt

$ 501.7

$ 10.0

Short-term borrowings and current portion of long-term debt

Short-term borrowings and the current portion of long-term debt at March 31, 2019, and December 31, 2018, consisted of the following:

	March 31, 2019			December 31, 2018
Zero-coupon convertible subordinated notes	$	1.4		$	8.7
2.625% senior notes due 2020	500.0			—
Debt issuance costs	(1.5		)	(0.5		)
Current portion of note payable	1.8			1.8
Total short-term borrowings and current portion of long-term debt	$	501.7		$	10.0

Senior notes due 2020 [Member]

Short-term Debt [Line Items]

Senior Notes, Noncurrent

$ 0.0

500.0

Debt Instrument, Interest Rate, Stated Percentage

4.625%

Senior notes due 2022 [Member]

Short-term Debt [Line Items]

Senior Notes, Noncurrent

$ 500.0

$ 500.0