Accumulated Other Comprehensive Loss, Net of Tax Reclassification of Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Reclassification of Accumulated Other Comprehensive Income [Abstract]
Foreign currency translation adjustments	$ (0.9)		$ 0
Gains on available-for-sale securities	0		(1.0)
Losses on derivative instruments	0.4		0.4
Amortization of defined benefit pension and postretirement plans items	2.6	[1]	2.8	[1]
Tax effect	(0.5)		(0.8)
Total amount reclassified from accumulated other comprehensive loss, net of tax	$ 1.6		$ 1.4

[1] These accumulated other comprehensive loss components are included in the computation of net periodic cost. See Note 10 for further information.