Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [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, 2017:
Assets:
Available-for-sale securities	$	—	$	45.4	$	—	$	45.4
Liabilities:
Deferred compensation plans	—		62.9		—		62.9
December 31, 2016:
Assets:
Available-for-sale securities	$	117.8	$	52.3	$	—	$	170.1
Liabilities:
Deferred compensation plans	—		52.2		—		52.2

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):

	2017				2016
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Available-for-sale securities	$	45.4	$	45.4	$	170.1	$	170.1
Liabilities:
Short-term borrowings	194.7		194.7		2,594.8		2,594.8
Long-term borrowings	10,327.4		10,847.1		9,674.2		10,095.1