Fair Value Measurements (Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset		$ 8.1	$ 58.8
Liabilities		9.6	50.2
Derivative liability		77.4	22.7
Liabilities Held For Sale, Current		16.2	13.7
Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities		9.6	50.2
Investments, Fair Value Disclosure		166.1	290.1
Liabilities Held For Sale, Current		16.2	13.7
Financial Liabilities Fair Value Disclosure		608.0	462.8
Fair value, measurements, recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure		40.4	63.7
Fair value, measurements, recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure		115.6	175.6
Financial Liabilities Fair Value Disclosure		183.3	137.1
Fair value, measurements, recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities		9.6	50.2
Investments, Fair Value Disclosure		9.6	50.2
Liabilities Held For Sale, Current		16.2	13.7
Financial Liabilities Fair Value Disclosure		424.7	325.7
Synthetic bonds - embedded derivatives | Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Synthetic bonds - embedded derivatives		408.5	312.0
Synthetic bonds - embedded derivatives | Fair value, measurements, recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Synthetic bonds - embedded derivatives		408.5	312.0
Call option | Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset		9.2	62.2
Call option | Fair value, measurements, recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset		9.2	62.2
Foreign exchange contract | Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset		104.8	111.0
Derivative liability		174.1	74.9
Foreign exchange contract | Fair value, measurements, recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset		104.8	111.0
Derivative liability		174.1	74.9
Embedded derivative financial instruments | Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability		9.2	62.2
Embedded derivative financial instruments | Fair value, measurements, recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability		9.2	62.2
Nonqualified Plan [Member] | Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	[1]	40.4	63.7
Money market fund		1.6	2.4
Stable value fund	[2]	0.5	0.6
Nonqualified Plan [Member] | Fair value, measurements, recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	[1]	40.4	63.7
Nonqualified Plan [Member] | Fair value, measurements, recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market fund		$ 1.6	$ 2.4

[1] Includes 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.