Financial Instruments and Risk Management (Schedule of Fair Value of All Derivative Contracts) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	$ 10.4	$ 20.6
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	16.5	13.8
Derivative Asset, Fair Value	159.2	115.0
Derivative Liability, Fair Value	16.5	13.8
Accounts Payable [Member]
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Liabilities, Fair Value	0
Prepaid Expenses And Other [Member]
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value	1.2
Interest Rate Swap Agreements [Member] | Other Assets [Member]
Fair Value Hedge Assets	147.6	94.4
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	6.0	9.5
Interest Rate Swap Agreements [Member] | Other Liabilities [Member]
Fair Value Hedge Liabilities	0	0
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	6.0	9.5
Foreign Exchange Contract [Member] | Accounts Payable [Member]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	10.5	4.3
Foreign Exchange Contract [Member] | Prepaid Expenses And Other [Member]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	4.4	11.1
Designated as Hedging Instrument [Member]
Derivative Asset, Fair Value	148.8
Derivative Liability, Fair Value	$ 0