Income Taxes (Tax Examinations) (Details) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Examination [Line Items]
Income Tax Expense (Benefit)	$ (23.0)	$ (6.7)	$ (6.0)	$ (9.7)	$ (1.0)	$ (1.6)	$ (2.2)	$ 4.6		$ (45.4)	$ (0.2)	$ (14.8)
Unrecognized tax benefit recognition including interest and penalties, if recognized, would effect income tax expense	$ 5.2									$ 5.2
Tax Assessment Year 2010 to 2012 [Member]
Income Tax Examination [Line Items]
Income Tax Expense (Benefit)			(3.5)
Tax Assessment Year 2005 to 2006 [Member]
Income Tax Examination [Line Items]
Income Tax Expense (Benefit)									$ (5.0)
Tax Assessment Year 2007 to 2009 [Member]
Income Tax Examination [Line Items]
Income Tax Expense (Benefit)				$ (12.8)
Tax Year 2012 [Member]
Income Tax Examination [Line Items]
Operating Loss Carryforwards			$ 0.6