Fair Value (Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Available-for-sale securities		$ 2.8	$ 2.7
Carrying Amount [Member]
Available-for-sale securities		2.8	2.7
Debt maturing within one year	[1]	(117.2)	(137.1)
Long-term debt	[1]	(2,196.3)	(2,463.9)
Foreign exchange forward contracts		0.0	(4.4)
Fair Value [Member]
Available-for-sale securities		2.8	2.7
Debt maturing within one year	[1]	(117.2)	(137.1)
Long-term debt	[1]	(1,717.8)	(2,242.5)
Foreign exchange forward contracts		$ 0.0	$ (4.4)

[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.