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Quarterly report pursuant to Section 13 or 15(d)

DEBT AND CREDIT FACILITIES DEBT AND CREDIT FACILITIES (Schedule of Extinguishment of Debt) (Details)

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DEBT AND CREDIT FACILITIES DEBT AND CREDIT FACILITIES (Schedule of Extinguishment of Debt) (Details) - Debt Repurchase [Member] - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Debt Instrument [Line Items] Ìý Ìý
Extinguishment of Debt, Amount $ 1.0 $ 16.5
$400 Million 5.90% 2020 Senior Notes [Member] Ìý Ìý
Debt Instrument [Line Items] Ìý Ìý
Extinguishment of Debt, Amount 0.0 0.5
$500 million 4.80% 2020 Senior Notes [Member] Ìý Ìý
Debt Instrument [Line Items] Ìý Ìý
Extinguishment of Debt, Amount 0.0 0.1
$700 Million 4.875% 2021 Senior Note [Member] Ìý Ìý
Debt Instrument [Line Items] Ìý Ìý
Extinguishment of Debt, Amount 1.0 14.2
$1,075 Million 5.75% 2025 Senior Notes [Member] Ìý Ìý
Debt Instrument [Line Items] Ìý Ìý
Extinguishment of Debt, Amount $ 0.0 $ 1.7