Other Income (Expense), Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Other Income and Expenses [Abstract]
Interest income	$ 0.3		$ 0.1		$ 0.8		$ 0.2
Unrealized gains (losses) on financial derivatives	2.2	[1]	1.6	[1]	3.6	[1]	1.1	[1]
Realized gains on investments	0		0.3		0.4		1.1
Receipts of cash dividends from distribution of bankruptcy trust	0	[2]	0.6	[2]	0	[2]	0.6	[2]
All other, net	(0.3)		0.3		1.1		0.1
Other non-operating income, net	$ 2.2		$ 2.9		$ 5.9		$ 3.1

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

[2] See Note 10 for discussion of the distribution.