Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	0 Months Ended
	Sep. 30, 2013	Jun. 08, 2015	Jun. 04, 2015
Tax Year 2008
Gain Contingencies [Line Items]
Recovery of excessive taxes and interest	$ 0.9
Subsequent event
Gain Contingencies [Line Items]
Recovery of excessive taxes and interest		4.0
Subsequent event | Tax Years 2005 - 2006
Gain Contingencies [Line Items]
Recovery of excessive taxes and interest		1.6
Subsequent event | Selling, and administrative costs | Tax Years 2007, 2009 and 2010
Gain Contingencies [Line Items]
Recovery of excessive taxes and interest		1.6
Subsequent event | Minimum | Reduction in taxes | Tax Years 2007 - 2012
Gain Contingencies [Line Items]
Potential aggregate recovery (maximum)			2.8
Subsequent event | Maximum | Reduction in taxes | Tax Years 2007 - 2012
Gain Contingencies [Line Items]
Potential aggregate recovery (maximum)			$ 4.6