Debt and Credit Facilities (Short-Term Borrowings and Current Maturities of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Short-term borrowings and current maturities of long-term debt	$ 1,024.6	$ 763.3
Debentures With Put Feature [Member]
Short-term borrowings and current maturities of long-term debt	343.6	343.6
Exchangeable Senior Notes [Member]
Short-term borrowings and current maturities of long-term debt	0	341.2
6.000% Senior Notes Due 2013 [Member]
Short-term borrowings and current maturities of long-term debt	600.0	0
Current Maturities Of Long Term Debt [Member]
Short-term borrowings and current maturities of long-term debt	10.2	12.5
Other Short Term Borrowings [Member]
Short-term borrowings and current maturities of long-term debt	$ 70.8	$ 66.0