Debt and Credit Facilities (Short-Term Borrowings and Current Maturities of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Short-term Debt [Line Items]
Short-term Debt	$ 763.3	$ 761.6
Debentures With Put Feature [Member]
Short-term Debt [Line Items]
Short-term Debt	343.6	343.6
Exchangeable Senior Notes [Member]
Short-term Debt [Line Items]
Short-term Debt	341.2	328.3
Current Maturities of Long Term Debt [Member]
Short-term Debt [Line Items]
Short-term Debt	12.5	13.3
Other Short Term Borrowings [Member]
Short-term Debt [Line Items]
Short-term Debt	$ 66.0	$ 76.4