Joint Venture Investment Schedule of purchase price allocation parenthetical (Details) (Conversion of Matariki shareholder debt to preferred equity [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	Apr. 04, 2013
Conversion of Matariki shareholder debt to preferred equity [Member]
Debt Conversion [Line Items]
Original debt amount	$ 125.5
Type of debt	shareholder loans payable to the noncontrolling interest by the New Zealand JV
Converted instrument amount	$ 96.0
Converted instrument type	preferred equity