Lines of Credit and Financing Arrangements (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	May 31, 2010
Short-Term Debt:
Foreign obligations	$ 14.2	$ 4.7
Total short-term debt	14.2	4.7
Current maturities of long-term debt	0.5	0.8
Long-Term Debt:
Capital lease obligations	16.7	16.6
Domestic revolving credit facility	297.5	243.0
Total long-term debt	514.2	459.6
Total debt	528.9	465.1
Senior Notes [Member]
Long-Term Debt:
Senior unsecured notes	$ 200.0	$ 200.0	$ 200.0