Derivative Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified												9 Months Ended		12 Months Ended																			12 Months Ended	1 Months Ended	9 Months Ended		1 Months Ended
	Sep. 30, 2013 2.450% senior notes due 2015	Sep. 30, 2013 2.450% senior notes due 2015 Senior Notes	Sep. 30, 2013 1.900% senior notes due 2017	Sep. 30, 2013 1.900% senior notes due 2017 Senior Notes	Sep. 30, 2013 3.950% senior notes due 2020	Sep. 30, 2013 3.950% senior notes due 2020 Senior Notes	Sep. 30, 2013 3.250% senior notes due 2022	Sep. 30, 2013 3.250% senior notes due 2022 Senior Notes	Sep. 30, 2013 4.000% senior notes due 2023	Aug. 31, 2013 4.000% senior notes due 2023	Sep. 30, 2013 4.000% senior notes due 2023 Senior Notes	Sep. 30, 2013 Foreign currency forward contracts	Sep. 30, 2013 Designated as hedging instruments Foreign currency forward contracts	Dec. 31, 2012 Designated as hedging instruments Foreign currency forward contracts	Sep. 30, 2013 Designated as hedging instruments Foreign currency forward contracts Australian Dollar	Dec. 31, 2012 Designated as hedging instruments Foreign currency forward contracts Australian Dollar	Sep. 30, 2013 Designated as hedging instruments Foreign currency forward contracts British Pound	Dec. 31, 2012 Designated as hedging instruments Foreign currency forward contracts British Pound	Sep. 30, 2013 Designated as hedging instruments Foreign currency forward contracts Canadian Dollar	Dec. 31, 2012 Designated as hedging instruments Foreign currency forward contracts Canadian Dollar	Sep. 30, 2013 Designated as hedging instruments Foreign currency forward contracts Euro	Dec. 31, 2012 Designated as hedging instruments Foreign currency forward contracts Euro	Sep. 30, 2013 Designated as hedging instruments Foreign currency forward contracts Japanese Yen	Dec. 31, 2012 Designated as hedging instruments Foreign currency forward contracts Japanese Yen	Sep. 30, 2013 Designated as hedging instruments Foreign currency option contracts Purchased Put		Dec. 31, 2012 Designated as hedging instruments Foreign currency option contracts Purchased Put		Sep. 30, 2013 Designated as hedging instruments Foreign currency option contracts Written Call		Dec. 31, 2012 Designated as hedging instruments Foreign currency option contracts Written Call		Dec. 31, 2012 Designated as hedging instruments Treasury rate locks	Sep. 30, 2013 Designated as hedging instruments Interest rate swap contracts	Sep. 30, 2013 Designated as hedging instruments Interest rate swap contracts	Dec. 31, 2012 Designated as hedging instruments Interest rate swap contracts	Oct. 31, 2013 Designated as hedging instruments Interest rate swap contracts Subsequent Event	Oct. 31, 2013 Designated as hedging instruments Interest rate swap contracts Subsequent Event 5 year maturity	Oct. 31, 2013 Designated as hedging instruments Interest rate swap contracts Subsequent Event 10 year maturity	Sep. 30, 2013 Designated as hedging instruments Interest rate swap contracts 2.450% senior notes due 2015 Senior Notes	Dec. 31, 2012 Designated as hedging instruments Interest rate swap contracts 2.450% senior notes due 2015 Senior Notes	Sep. 30, 2013 Designated as hedging instruments Interest rate swap contracts 1.900% senior notes due 2017 Senior Notes	Dec. 31, 2012 Designated as hedging instruments Interest rate swap contracts 1.900% senior notes due 2017 Senior Notes	Sep. 30, 2013 Designated as hedging instruments Interest rate swap contracts 3.950% senior notes due 2020 Senior Notes	Dec. 31, 2012 Designated as hedging instruments Interest rate swap contracts 3.950% senior notes due 2020 Senior Notes	Sep. 30, 2013 Designated as hedging instruments Interest rate swap contracts 3.250% senior notes due 2022 Senior Notes	Dec. 31, 2012 Designated as hedging instruments Interest rate swap contracts 3.250% senior notes due 2022 Senior Notes	Sep. 30, 2013 Designated as hedging instruments Interest rate swap contracts 4.000% senior notes due 2023 Senior Notes	Dec. 31, 2012 Designated as hedging instruments Interest rate swap contracts 4.000% senior notes due 2023 Senior Notes	Sep. 30, 2013 Not designated as hedging instruments Foreign currency forward contracts	Dec. 31, 2012 Not designated as hedging instruments Foreign currency forward contracts	Sep. 30, 2013 Not designated as hedging instruments Foreign currency option contracts Purchased Put		Dec. 31, 2012 Not designated as hedging instruments Foreign currency option contracts Purchased Put		Sep. 30, 2013 Not designated as hedging instruments Foreign currency option contracts Written put		Dec. 31, 2012 Not designated as hedging instruments Foreign currency option contracts Written put
Derivative Instruments and Hedging Activities
Period to settlement dates of derivatives is within this period												3 years	36 months	36 months
Summary of Derivative Instruments
Notional amount													$ 3,580.7	$ 1,422.9	$ 53.7	$ 5.1	$ 313.8	$ 77.9	$ 84.7	$ 134.4	$ 2,425.3	$ 969.3	$ 703.2	$ 236.2	$ 24.3	[1]	$ 228.8	[1]	$ 25.4	[1]	$ 235.9	[1]		$ 2,000.0	$ 2,000.0	$ 300.0				$ 300.0	$ 0	$ 300.0	$ 100.0	$ 500.0	$ 0	$ 850.0	$ 200.0	$ 50.0	$ 0			$ 22.7	[1]	$ 160.5	[1]	$ (22.7)	[1]	$ (216.0)	[1]
Notional amount entered into during period																																		100.0			150.0	100.0	50.0
Derivative term																																			10 years
Aggregate notional amount of foreign currency forward non-designated hedging contracts																																																		816.1	795.4
Derivative settlement losses																																	35.3
Interest rate (as a percent)	2.45%	2.45%	1.90%	1.90%	3.95%	3.95%	3.25%	3.25%	4.00%	4.00%	4.00%
Proceeds from settlement of interest rate swap contracts																																			$ 21.9

[1] U.S. Dollar notional amounts are calculated as the hedged local currency amount multiplied times the strike value of the foreign currency option. The local currency notional amounts of our purchased put and written call that are designated as hedging activity are equal to each other.