DERIVATIVES AND OTHER FINANCIAL INSTRUMENTS (Details 3) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Jul. 31, 2011	Nov. 30, 2010	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	May. 31, 2014
Interest rate swap fair value hedges
Money market funds, classified as Level Two			$ 443.1		$ 443.1		$ 395.4
Interest Rate Swap [Member]
Interest rate swap fair value hedges
Notional Amount of Underlying Debt			500.0		500.0
Amortization of basis adjustment for terminated interest rate swaps recognized in interest expense			0.4		0.7
Commodity Option [Member]
Interest rate swap fair value hedges
Notional Amount			2.0		2.0
Fair value hedges
Interest rate swap fair value hedges
Notional Amount								$ 700.0
Fair value hedges | Interest Rate Swap [Member]
Interest rate swap fair value hedges
Notional Amount of Underlying Debt			700.0		700.0
Amortization of basis adjustment for terminated interest rate swaps recognized in interest expense			2.5	$ 1.0	5.2	$ 1.0
Fair value hedges | Interest Rate Swap [Member] | Terminated contracts
Interest rate swap fair value hedges
Notional Amount	$ 500.0	$ 200.0
Cash received	$ 23.5	$ 15.6
Amortization of basis adjustment for terminated interest rate swaps recognized in interest expense			$ 0.5	$ 2.3	$ 0.9	$ 4.6
4.90% Notes due 2019
Interest rate swap fair value hedges
Stated rate (as a percent)			4.90%		4.90%		4.90%
4.90% Notes due 2019 | Fair value hedges | 4.60% Notes due 2044
Interest rate swap fair value hedges
Notional Amount								$ 700.0
Stated rate (as a percent)			4.90%		4.90%
variableratepaid			3.14%		3.14%
Fair Value Hedge Liabilities			$ 2.2		$ 2.2