Divestitures (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2014 Subsequent Event [Member] Corporate and Other [Member] Customer Lead Distribution Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash received from business divestitures, net of cash relinquished	$ 10.1	$ 6.8	$ 4.9
Loss from discontinued operations, net of income taxes	0.9	0.9	2.8
Total assets of discontinued operations	36.7	45.4
Cash and other consideration received on disposal				11
Gain (loss) on disposal				8
Gain (loss) on disposal, net of taxes				$ 5