Income Taxes (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Foreign Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 5.1	$ 3.6
Foreign Federal 2033 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 11.4	6.4
Expiration date (beginning in 2033)	Dec. 31, 2033
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 1.4	$ 0.8
Expiration date (beginning in 2033)	Dec. 31, 2033
Canadian Provincial [Member]
Income Tax Examination [Line Items]
Total reassessments including interest	$ 94.4
Amount of security posted in the form of a performance bond	61.2
Amount of security posted in the form of cash	29.2
Amount of security payable	$ 4.0
Canadian Provincial [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Years under examination	2002
Canadian Provincial [Member] | Maximum [Member]
Income Tax Examination [Line Items]
Years under examination	2011
Canadian Federal and Provincial [Member] | Tax Year 2004 Through 2006 [Member]
Income Tax Examination [Line Items]
Amount of security posted in the form of a performance bond	$ 20.6
Total reassessment amount including penalty and interest	95.6
Amount of security in the form of a bank letter guarantee	37.2
Canadian Federal and Provincial [Member] | Tax Year 2007 Through 2008 [Member]
Income Tax Examination [Line Items]
Amount of security posted in the form of a performance bond	9.2
Total reassessment amount including penalty and interest	33.8
Amount of security in the form of a bank letter guarantee	$ 10.1
Canadian Federal and Provincial [Member] | Minimum [Member] | Tax Year 2004 Through 2006 [Member]
Income Tax Examination [Line Items]
Years under examination	2004
Canadian Federal and Provincial [Member] | Minimum [Member] | Tax Year 2007 Through 2008 [Member]
Income Tax Examination [Line Items]
Years under examination	2007
Canadian Federal and Provincial [Member] | Maximum [Member] | Tax Year 2004 Through 2006 [Member]
Income Tax Examination [Line Items]
Years under examination	2006
Canadian Federal and Provincial [Member] | Maximum [Member] | Tax Year 2007 Through 2008 [Member]
Income Tax Examination [Line Items]
Years under examination	2008