Fair Value Measurements (Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets		$ 176.7	$ 180.1
Liabilities, Fair Value Disclosure [Abstract]
Redeemable financial liability			174.8
Derivative financial instrument liabilities		132.7	352.8
Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Traded securities	[1]	27.5
Money market fund		1.9
Stable value fund	[2]	0.8
Available-for-sale securities		24.6	27.9
Total assets		264.8	265.9
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities		467.1	585.5
Fair Value, Measurements, Recurring [Member] | Long-term – Derivative financial instruments – Synthetic Bonds – Call Option Premium
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets		47.3	180.1
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets		162.7	57.9
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities		118.7	230.6
Fair Value, Measurements, Recurring [Member] | Long-term – Derivative financial instruments – Synthetic Bonds – Embedded Derivatives
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities		47.3	180.1
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Traded securities	[1]	27.5
Available-for-sale securities		24.6	27.9
Total assets		52.1	27.9
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Money market fund		1.9
Total assets		211.9	238.0
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities		166.0	410.7
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Long-term – Derivative financial instruments – Synthetic Bonds – Call Option Premium
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets		47.3	180.1
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets		162.7	57.9
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities		118.7	230.6
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Long-term – Derivative financial instruments – Synthetic Bonds – Embedded Derivatives
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities		47.3	180.1
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities		301.1	174.8
Mandatorily Redeemable Financial Liability | Fair Value, Measurements, Recurring [Member]
Liabilities, Fair Value Disclosure [Abstract]
Redeemable financial liability		301.1	174.8
Mandatorily Redeemable Financial Liability | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Redeemable financial liability		$ 301.1	$ 174.8

[1] Includes equity securities, fixed income and other investments measured at fair value.

[2] Certain investments that are measured at fair value using net asset value per share (or its equivalent) have not been classified in the fair value hierarchy.