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SUBSEQUENT EVENTS (Details) 10Q - USD ($) $ / shares in Units, $ in Millions					12 Months Ended
	Dec. 15, 2017	Nov. 15, 2017	Apr. 12, 2017	Apr. 04, 2017	Dec. 31, 2017	Dec. 31, 2016
Subsequent Events
Interest rate (as a percent)	4.375%
Illinois
Subsequent Events
Cash paid for acquisition			$ 9.7		$ 9.7
Illinois | Class C units
Subsequent Events
Stated value (in dollars per share)					$ 25
Distribution rate (as a percent)					3.00%
Senior notes 4.375% due 2023
Subsequent Events
Proceeds from senior notes	$ 250.0			$ 50.0
Senior notes, principal amount					$ 300.0	$ 300.0
Interest rate (as a percent)				4.375%	4.375%	4.375%
Debt instrument, redemption percentage	98.995%			105.04%
Effective interest rate (as a percent)					4.33%
Senior notes 4.000% due 2025
Subsequent Events
Proceeds from senior notes		$ 250.0		$ 50.0
Senior notes, principal amount					$ 300.0	$ 300.0
Interest rate (as a percent)		4.00%		4.00%	4.00%	4.00%
Debt instrument, redemption percentage		99.735%		101.343%
Effective interest rate (as a percent)		4.032%		3.811%	3.99%

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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