Debt (Exchange Offer) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Jun. 18, 2013 Senior Notes 2016 Senior Notes (1.800% coupon)		Jun. 18, 2013 Senior Notes 2018 Senior Notes (2.600% coupon)
Debt Instrument [Line Items]
Long-term debt, gross	$ 6,274.0	$ 500.0		$ 650.0
Debt instrument, interest rate, stated percentage		1.80%	[1]	2.60%	[2]

[1] (a)Instrument is callable by the Company at any time at the greater of 100% of the principal amount or the sum of the present values of the remaining scheduled payments of principal and interest discounted at the U.S. Treasury rate plus 0.20% plus, in each case, accrued and unpaid interest.

[2] Instrument is callable by the Company at any time at the greater of 100% of the principal amount or the sum of the present values of the remaining scheduled payments of principal and interest discounted at the U.S. Treasury rate plus 0.50% plus, in each case, accrued and unpaid interest.