Other Income, Net - Schedule of Components of Other Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Securities earnings:
Dividends and interest	$ 6.7	$ 6.5
Securities transactions, net	0.1	0.1
Total	6.8	6.6
Equity in earnings of investees	(0.1)	(0.3)
Currency transactions, net	(2.7)	1.7
Insurance recoveries	0.8	0.6
Other, net	0.3	0.2
Total	$ 5.1	$ 8.8