Derivative Instruments and Hedging Activities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Foreign Exchange Contract [Member]	Sep. 30, 2013 Intercompany Loans [Member]	Sep. 30, 2012 Intercompany Loans [Member]	Sep. 30, 2013 Intercompany Loans [Member]	Sep. 30, 2012 Intercompany Loans [Member]	Sep. 30, 2013 January 2013 Interest-Rate Swap Termination [Member]	Sep. 30, 2013 January 2013 Interest-Rate Swap Termination [Member]	Jan. 31, 2013 January 2013 Interest-Rate Swap Termination [Member]	Sep. 30, 2013 March 2012 Interest-Rate Swap Termination [Member]	Sep. 30, 2012 March 2012 Interest-Rate Swap Termination [Member]	Sep. 30, 2013 March 2012 Interest-Rate Swap Termination [Member]	Sep. 30, 2012 March 2012 Interest-Rate Swap Termination [Member]
Minimum Cumulative Rate Percentage of Fair Value Derivative to Qualify as Highly Effective Derivative Instrument					85.00%
Maximum Cumulative Rate Percentage of Fair Value Derivative to Qualify as Highly Effective Derivative Instrument					125.00%
Percentage of long-term, fixed-rate borrowings converted to variable interest rate instruments using interest rate swaps					62.00%
Total exposure to floating rate interest rates	9.00%		9.00%		69.00%
Notional Amount Related to Discontinuation of Interest Rate Fair Value Hedge													$ 1,000		$ 350		$ 350
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge															46.1		46.1
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge											67.8	67.8	90.4	37.2		37.2
Interest Rate Swap Termination Fee											2.3	2.3			2.5		2.5
Amortization of Interest Rate Swap Gains											3.6	22.6		1.5	1.5	4.5	2.9
Change in fair market value of interest-rate swap agreements	0	0.4	(0.7)	(0.7)
Gain (Loss) on Interest Rate Fair Value Hedge Ineffectiveness	0	0	0	0
Notional amounts of foreign currency exchange contracts						186
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments							2.6	9.8	(5.5)	4.2
Gain (loss) due to the effect of foreign currency exchange rates on intercompany loans							(1.9)	(8.8)	6.7	(1.4)
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion	$ 0	$ 0	$ 0	$ (0.3)