Financial Instruments and Risk Management (Schedule of Fair Value of All Derivative Contracts) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	$ 6.6	$ 10.4
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	3.2	16.5
Derivative Asset, Fair Value	99.7	159.2
Derivative Liability, Fair Value	3.2	16.5
Interest Rate Swap Agreements [Member] | Other assets and prepaid expenses and other [Member]
Fair Value Hedge Assets	93.1
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
Interest Rate Swap Agreements [Member] | Other Assets [Member]
Fair Value Hedge Assets		147.6
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value		6.0
Interest Rate Swap Agreements [Member] | Accounts Payable [Member]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	1.7
Interest Rate Swap Agreements [Member] | Prepaid Expenses And Other [Member]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	1.7
Foreign Exchange Contract [Member] | Accounts Payable [Member]
Fair Value Hedge Liabilities		0
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	1.5	10.5
Foreign Exchange Contract [Member] | Prepaid Expenses And Other [Member]
Fair Value Hedge Assets		1.2
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	4.9	4.4
Designated as Hedging Instrument [Member]
Derivative Asset, Fair Value	93.1	148.8
Derivative Liability, Fair Value	$ 0	$ 0