Accumulated Other Comprehensive Loss, net of tax Reclassifications out of Accumulated Comprehensive Loss, net of tax (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Foreign currency translation adjustments	$ 0
Gains on available-for-sale securities	1.4		(0.7)	(0.3)
Losses on derivative instruments	(1.7)		(0.3)	0
Amortization of defined benefit pension and postretirement plans items 1	(10.8)	[1]	(7.7)	(7.5)
Tax effect	$ (2.4)

[1] 1 These accumulated other comprehensive loss components are included in the computation of net periodic cost. See Note 13 for further information