Derivative Instruments and Hedging Activities (Fair Value of Derivative Instruments Outstanding) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value Hedge Liabilities	$ 0	$ 0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	7.8	10.4
Fair Value Hedge Assets	100.8	148.8
Derivative Asset Designated as Hedging Instrument, Fair Value	108.6	159.2
Derivative Liability Designated as Hedging Instrument, Fair Value	3.2	16.5
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	3.2	16.5
Interest-Rate Swap Agreements [Member] | Other Assets [Member]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	2.9	6.0
Fair Value Hedge Assets	100.8	147.6
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	2.8	6.0
Foreign Exchange Forward Contracts [Member] | Other Current Assets [Member]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	4.9	4.4
Derivative Asset Designated as Hedging Instrument, Fair Value		1.2
Foreign Exchange Forward Contracts [Member] | Accounts Payable [Member]
Fair Value Hedge Liabilities		0
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	$ 0.4	$ 10.5