Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value, Liabilities Measured on Recurring Basis

Financial 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, 2019
Deferred compensation liabilities	$	—	$	29.6	$	—	$	29.6
December 31, 2018
Deferred compensation liabilities	$	—	$	20.8	$	—	$	20.8

Carrying Values and Fair Values of Financial Instruments

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

	2019				2018
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Current portion of long-term debt	$	1,500.0	$	1,500.0	$	455.6	$	454.9
Long-term debt, net of current maturities	$	4,828.4	$	4,992.3	$	2,974.7	$	2,867.5