Fair Value Measurements (Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets		$ 154.1	$ 180.1
Liabilities, Fair Value Disclosure [Abstract]
Redeemable financial liability			174.8
Derivative financial instrument liabilities		200.7	352.8
Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Traded securities	[1]	26.7
Money market fund		2.0
Stable value fund	[2]	0.8
Available-for-sale securities		25.7	27.9
Total assets		216.1	265.9
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities		435.3	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		60.9	180.1
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets		100.0	57.9
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities		146.6	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		60.9	180.1
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Traded securities	[1]	26.7
Available-for-sale securities		25.7	27.9
Total assets		52.4	27.9
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Money market fund		2.0
Total assets		162.9	238.0
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities		207.5	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		60.9	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		100.0	57.9
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities		146.6	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		60.9	180.1
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities		227.8	174.8
Mandatorily Redeemable Financial Liability | Fair Value, Measurements, Recurring [Member]
Liabilities, Fair Value Disclosure [Abstract]
Redeemable financial liability		227.8	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		$ 227.8	$ 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.