Fair Value Measurements (Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets	$ 77.4	$ 58.8
Asset held for sale	25.0	50.2
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities	14.2	22.7
Liabilities held for sale	12.8	13.7
Fair value, measurements, recurring
Assets, Fair Value Disclosure [Abstract]
Traded securities	27.1	26.2
Money market fund	2.2	2.4
Stable value fund	0.6	0.6
Available-for-sale securities	25.7	37.5
Asset held for sale	25.0	50.2
Total assets	259.7	290.1
Liabilities, Fair Value Disclosure [Abstract]
Liabilities held for sale	12.8	13.7
Total liabilities	511.9	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	43.0	62.2
Fair value, measurements, recurring | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets	136.1	111.0
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities	72.9	74.9
Fair value, measurements, recurring | Long-term - Derivative financial instruments - Synthetic Bonds - Embedded Derivatives
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities	43.0	62.2
Fair value, measurements, recurring | Level 1
Assets, Fair Value Disclosure [Abstract]
Traded securities	27.1	26.2
Money market fund	0.0	0.0
Available-for-sale securities	25.7	37.5
Total assets	52.8	63.7
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	0.0	0.0
Fair value, measurements, recurring | Level 1 | Long-term - Derivative financial instruments - Synthetic Bonds - Call Option Premium
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets	0.0	0.0
Fair value, measurements, recurring | Level 1 | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets	0.0	0.0
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities	0.0	0.0
Fair value, measurements, recurring | Level 1 | Long-term - Derivative financial instruments - Synthetic Bonds - Embedded Derivatives
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities	0.0	0.0
Fair value, measurements, recurring | Level 2
Assets, Fair Value Disclosure [Abstract]
Traded securities	0.0	0.0
Money market fund	2.2	2.4
Available-for-sale securities	0.0	0.0
Asset held for sale	0.0	0.0
Total assets	181.3	175.6
Liabilities, Fair Value Disclosure [Abstract]
Liabilities held for sale	0.0	0.0
Total liabilities	115.9	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	43.0	62.2
Fair value, measurements, recurring | Level 2 | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets	136.1	111.0
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities	72.9	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	43.0	62.2
Fair value, measurements, recurring | Level 3
Assets, Fair Value Disclosure [Abstract]
Traded securities	0.0	0.0
Money market fund	0.0	0.0
Available-for-sale securities	0.0	0.0
Asset held for sale	25.0	50.2
Total assets	25.0	50.2
Liabilities, Fair Value Disclosure [Abstract]
Liabilities held for sale	12.8	13.7
Total liabilities	396.0	325.7
Fair value, measurements, recurring | Level 3 | Long-term - Derivative financial instruments - Synthetic Bonds - Call Option Premium
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets	0.0	0.0
Fair value, measurements, recurring | Level 3 | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets	0.0	0.0
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities	0.0	0.0
Fair value, measurements, recurring | Level 3 | Long-term - Derivative financial instruments - Synthetic Bonds - Embedded Derivatives
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities	0.0	0.0
Redeemable financial liability | Fair value, measurements, recurring
Liabilities, Fair Value Disclosure [Abstract]
Redeemable financial liability	383.2	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	$ 383.2	$ 312.0