Derivative Instruments and Hedging Activities (Fair Value of Derivative Instruments Outstanding) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivatives designated as hedges, asset		$ 93.1
Derivatives designated as hedges, liability		0
Derivatives not designated as hedges, asset	2.6	6.6
Derivatives not designated as hedges, liability	4.1	3.2
Total derivatives, asset	2.6	99.7
Total derivatives, liability	4.1	3.2
Interest-Rate Swap Agreements [Member] | Prepaid expenses and other [Member]
Derivatives not designated as hedges, asset		1.7
Interest-Rate Swap Agreements [Member] | Other assets and prepaid expenses and other [Member]
Derivatives designated as hedges, asset		93.1
Interest-Rate Swap Agreements [Member] | Other liabilities [Member]
Derivatives designated as hedges, liability		0
Interest-Rate Swap Agreements [Member] | Accounts payable [Member]
Derivatives not designated as hedges, liability		1.7
Foreign Exchange Forward Contracts [Member] | Prepaid expenses and other [Member]
Derivatives not designated as hedges, asset	2.6	4.9
Foreign Exchange Forward Contracts [Member] | Accounts payable [Member]
Derivatives not designated as hedges, liability	$ 4.1	$ 1.5