Schedule of Income Taxes Paid and Refunded (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes Paid, Net [Abstract]
Income Taxes Paid	$ 8.6	$ 10.8	$ 15.1
Income tax refunds received	(10.5)	(63.3)	(20.2)
Income Taxes Paid (Received), Net, Total	(1.9)	(52.5)	$ (5.1)
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	323.0
Tax credit carryforwards	52.0
Income Taxes Paid, Net [Abstract]
Income tax refunds received	$ (7.3)	$ (59.9)