Schedule of Income Taxes Paid and Refunded (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes Paid, Net [Abstract]
Income Taxes Paid	$ 10.8	$ 15.1	$ 21.4
Income tax refunds received	63.3	20.2	18.3
Income Taxes Paid (Received), Net, Total	(52.5)	$ (5.1)	$ 3.1
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	166.0
Tax credit carryforwards	43.0
Income Taxes Paid, Net [Abstract]
Income tax refunds received	$ 59.9