Other Income (Expense), Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Other Income (Expense), Net
Interest income	$ 0.3		$ 0.1
Unrealized gains on financial derivatives	0.9	[1]	0.4	[1]
Realized gains on investments	0.2		0.5
All other, net	0.5		0
Other non-operating income, net	$ 1.9		$ 1.0

[1] See “Hedges Relating to the Convertible Notes” in Note 8 for discussion of such instruments.