Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Financial Assets And Liabilities Carried At Fair Value

A summary of financial assets and liabilities that are measured at fair value on a recurring basis were as follows ($ in millions):

	Quoted Prices in Active Market (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
December 31, 2018:
Assets:
Available-for-sale debt securities	$	—	$	38.3	$	—	$	38.3
Investment in equity securities	—		—		148.9		148.9
Liabilities:
Deferred compensation plans	—		60.9		—		60.9
December 31, 2017:
Assets:
Available-for-sale debt securities	$	—	$	45.4	$	—	$	45.4
Liabilities:
Deferred compensation plans	—		62.9		—		62.9

Carrying Amounts And Fair Values Of Financial Instruments

The carrying amounts and fair values of the Company’s financial instruments as of December 31 were as follows ($ in millions):

	2018				2017
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Available-for-sale debt securities	$	38.3	$	38.3	$	45.4	$	45.4
Investment in equity securities	148.9		148.9		—		—
Liabilities:
Notes payable and current portion of long-term debt	51.8		51.8		194.7		194.7
Long-term debt	9,688.5		9,990.6		10,327.4		10,847.1