Fair Value (Fair Value of Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Available-for-sale securities	$ 2.7		$ 2.7
Carrying Amount [Member]
Available-for-sale securities	2.7		2.7
Debt maturing within one year	(378.8)	[1]	(137.1)	[1]
Long-term debt	(2,208.2)	[1]	(2,463.9)	[1]
Foreign exchange forward contracts	(6.7)		(4.4)
Fair Value [Member]
Available-for-sale securities	2.7		2.7
Debt maturing within one year	(378.6)	[1]	(137.1)	[1]
Long-term debt	(1,984.8)	[1]	(2,242.5)	[1]
Foreign exchange forward contracts	$ (6.7)		$ (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.