Lines of Credit and Financing Arrangements (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	May 31, 2010
Short-Term Debt:
Foreign obligations	$ 4.7	$ 1.4
Total short-term debt	4.7	1.4
Current maturities of long-term debt	0.8	0.6
Long-Term Debt:
Capital lease obligations	16.6	17.0
Domestic revolving credit facility	243.0	100.0
Total long-term debt	459.6	317.0
Total debt	465.1	319.0
Senior Notes [Member]
Long-Term Debt:
Senior unsecured notes	$ 200.0	$ 200.0	$ 200.0