Lines of Credit and Financing Arrangements (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	May 31, 2010
Short-Term Debt:
Foreign obligations	$ 11.4	$ 4.7
Total short-term debt	11.4	4.7
Current maturities of long-term debt	0.6	0.8
Long-Term Debt:
Capital lease obligations	16.5	16.6
Domestic revolving credit facility	295.0	243.0
Total long-term debt	511.5	459.6
Total debt	523.5	465.1
Senior Notes [Member]
Long-Term Debt:
Senior unsecured notes	$ 200.0	$ 200.0	$ 200.0