Debt and Credit Facilities (Short-Term Borrowings and Current Maturities of Long-Term Debt) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Short-term Debt	$ 760.0	$ 761.6
Debentures With Put Feature [Member]
Short-term Debt	343.6	343.6
Exchangeable Senior Notes [Member]
Short-term Debt	338.0	328.3
Current Maturities Of Long Term Debt [Member]
Short-term Debt	10.7	13.3
Other Short Term Borrowings [Member]
Short-term Debt	$ 67.7	$ 76.4