Derivative Instruments and Hedging Activities (Fair Value of Derivative Instruments Outstanding) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivatives designated as hedges, asset	$ 0.4	$ 93.1
Derivatives designated as hedges, liability	0	0
Derivatives not designated as hedges, asset	5.3	6.6
Derivatives not designated as hedges, liability	4.6	3.2
Total derivatives, asset	5.7	99.7
Total derivatives, liability	4.6	3.2
Interest-Rate Swap Agreements [Member] | Prepaid Expenses and Other [Member]
Derivatives designated as hedges, asset	0.4
Derivatives not designated as hedges, asset	0.6	1.7
Interest-Rate Swap Agreements [Member] | Other Assets [Member]
Derivatives designated as hedges, asset		93.1
Interest-Rate Swap Agreements [Member] | Other Liabilities [Member]
Derivatives designated as hedges, liability	0	0
Interest-Rate Swap Agreements [Member] | Accounts Payable [Member]
Derivatives not designated as hedges, liability	0.6	1.7
Foreign Exchange Forward Contracts [Member] | Prepaid Expenses and Other [Member]
Derivatives not designated as hedges, asset	4.7	4.9
Foreign Exchange Forward Contracts [Member] | Accounts Payable [Member]
Derivatives not designated as hedges, liability	$ 4.0	$ 1.5