Income Taxes - Income Tax Expense (Benefit), (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income tax expense (benefit) [Abstract]
Continuing operations	$ 11.0	$ 23.3	$ 20.8
Discontinued operations	(2.1)	0	(0.6)
Income tax expense benefit continuing and discontinued operations	$ 8.9	$ 23.3	$ 20.2