Fair Value Measurements (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Fair Value, Measurements, Recurring Venture capital investments	Dec. 31, 2012 Fair Value, Measurements, Recurring Venture capital investments	Dec. 31, 2011 Fair Value, Measurements, Recurring Venture capital investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of year			$ 21.9	$ 20.3	$ 23.5
Unrealized gains included in earnings	10.5	5.4
Unrealized losses included in earnings	(6.3)	(9.2)
Purchases	0.7	0.6
Settlements	(3.3)	0
Fair value, end of year			$ 21.9	$ 20.3	$ 23.5