Fair Value (Fair Value of Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Available-for-sale securities	$ 2.6		$ 2.5
Money market funds			0.5
Carrying Amount [Member]
Available-for-sale securities	2.6		2.5
Money market funds	0		0.5
Debt maturing within one year	(154.1)	[1]	(188.0)	[1]
Long-term debt	(2,480.0)	[1]	(2,532.7)	[1]
Foreign exchange forward contracts	0		3.1
Fair Value [Member]
Available-for-sale securities	2.6		2.5
Money market funds	0		0.5
Debt maturing within one year	(154.1)	[1]	(188.0)	[1]
Long-term debt	(2,536.9)	[1]	(2,511.6)	[1]
Foreign exchange forward contracts	$ 0		$ 3.1

[1] The carrying value of debt maturing within one year and long-term debt includes any related discount or premium and unamortized deferred gains on terminated interest-rate swap agreements, as applicable.