Fair Value Measurements (Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets	$ 22.0	$ 58.8
Asset held for sale	33.9	50.2
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities	39.7	22.7
Liabilities held for sale	22.9	13.7
Fair value, measurements, recurring
Assets, Fair Value Disclosure [Abstract]
Traded securities	26.6	26.2
Money market fund	1.3	2.4
Stable value fund	0.5	0.6
Available-for-sale securities	22.4	37.5
Asset held for sale	33.9	50.2
Total assets	253.2	290.1
Liabilities, Fair Value Disclosure [Abstract]
Liabilities held for sale	22.9	13.7
Total liabilities	517.2	462.8
Fair value, measurements, recurring | Long-term - Derivative financial instruments - Synthetic Bonds - Call Option Premium
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets	76.3	62.2
Fair value, measurements, recurring | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets	92.2	111.0
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities	109.9	74.9
Fair value, measurements, recurring | Long-term - Derivative financial instruments - Synthetic Bonds - Embedded Derivatives
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities	76.3	62.2
Fair value, measurements, recurring | Level 1
Assets, Fair Value Disclosure [Abstract]
Traded securities	26.6	26.2
Available-for-sale securities	22.4	37.5
Total assets	49.0	63.7
Fair value, measurements, recurring | Level 2
Assets, Fair Value Disclosure [Abstract]
Money market fund	1.3	2.4
Total assets	169.8	175.6
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	186.2	137.1
Fair value, measurements, recurring | Level 2 | Long-term - Derivative financial instruments - Synthetic Bonds - Call Option Premium
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets	76.3	62.2
Fair value, measurements, recurring | Level 2 | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets	92.2	111.0
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities	109.9	74.9
Fair value, measurements, recurring | Level 2 | Long-term - Derivative financial instruments - Synthetic Bonds - Embedded Derivatives
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities	76.3	62.2
Fair value, measurements, recurring | Level 3
Assets, Fair Value Disclosure [Abstract]
Asset held for sale	33.9	50.2
Total assets	33.9	50.2
Liabilities, Fair Value Disclosure [Abstract]
Liabilities held for sale	22.9	13.7
Total liabilities	331.0	325.7
Redeemable financial liability | Fair value, measurements, recurring
Liabilities, Fair Value Disclosure [Abstract]
Redeemable financial liability	308.1	312.0
Redeemable financial liability | Fair value, measurements, recurring | Level 1
Liabilities, Fair Value Disclosure [Abstract]
Redeemable financial liability	0.0	0.0
Redeemable financial liability | Fair value, measurements, recurring | Level 2
Liabilities, Fair Value Disclosure [Abstract]
Redeemable financial liability	0.0	0.0
Redeemable financial liability | Fair value, measurements, recurring | Level 3
Liabilities, Fair Value Disclosure [Abstract]
Redeemable financial liability	$ 308.1	$ 312.0