Other (Expense) Income, Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loss on Extinguishment of Debt											$ (45.2)	$ 0	$ 0
Gains on sales of businesses and investments											1.5	88.2	125.9
Vendor discounts and credit adjustments											8.6	15.3	19.4
Other income (expense), net											2.8	(3.0)	4.9
Total other (expense) income, net	7.7	(46.6)	[1]	4.8	1.8	95.4	[1]	1.7	4.7	(1.3)	(32.3)	100.5	150.2
Gain on sale of portion of Facebook						$ 93.6
10.00% Senior Unsecured Notes due 2017
Stated Interest Rate	10.00%										10.00%

[1] The three months ended September 30, 2013 include a pre-tax loss of $45.2, related to our early extinguishment of debt. The three months ended December 31, 2012 include a pre-tax gain of $93.6 related to the sale of our holdings in Facebook.