Schedule of Income Taxes Paid and Refunded (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes Paid, Net [Abstract]
Income Taxes Paid	$ 10.4	$ 8.6	$ 10.8
Income tax refunds received	(7.1)	(10.5)	(63.3)
Income Taxes Paid (Received), Net, Total	3.3	(1.9)	$ (52.5)
Federal [Member]
Income Taxes Paid, Net [Abstract]
Income tax refunds received	$ (3.2)	$ (7.3)