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Investment in Affiliates (Details) (Waihonua Joint Venture, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Waihonua Joint Venture
Schedule of Equity Method Investments [Line Items]
Operating revenue	$ 242.3
Operating income	32.2
Income from continuing operations	32.2
Net income	$ 32.2

The amount of gross profit (loss) reported by an equity method investment of the entity.

The amount of net income (loss) reported by an equity method investment of the entity.