Fair Value Measurements (Assets And Liabilities Measured On A Recurring Basis) (Detail) - USD ($) $ in Millions		Mar. 31, 2017	Dec. 31, 2016
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets		$ 131.8	$ 180.1
Liabilities, Fair Value Disclosure [Abstract]
Redeemable financial liability			174.8
Derivative financial instrument liabilities		257.7	352.8
Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Traded securities	[1]	26.2
Money market fund		1.7
Stable value fund	[2]	0.8
Available-for-sale securities		29.5	27.9
Total assets		271.5	265.9
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities		582.1	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		108.4	180.1
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract
Assets, Fair Value Disclosure [Abstract]
Derivative financial instrument assets		104.9	57.9
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities		230.8	230.6
Fair Value, Measurements, Recurring [Member] | Derivative financial instruments - Embedded Derivatives
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities		108.4	180.1
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Traded securities	[1]	26.2
Available-for-sale securities		29.5	27.9
Total assets		55.7	27.9
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Money market fund		1.7
Total assets		215.0	238.0
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities		339.2	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		108.4	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		104.9	57.9
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities		230.8	230.6
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Derivative financial instruments - Embedded Derivatives
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instrument liabilities		108.4	180.1
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities		242.9	174.8
Mandatorily Redeemable Financial Liability | Fair Value, Measurements, Recurring [Member]
Liabilities, Fair Value Disclosure [Abstract]
Redeemable financial liability		242.9	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		$ 242.9	$ 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.