Derivative Instruments and Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2019

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Impact of Derivative Instruments on Consolidated Statements of Income and Accumulated OCI

The impact of derivative instruments on the consolidated statements of income and accumulated OCI was as follows (dollars in millions):

	Net Loss Recognized in Accumulated OCI (Effective Portion) December 31,
	2019		2018
Treasury locks, net of tax	$	—	$	(10.2	)

	Loss Reclassified from Accumulated OCI into Income (Effective Portion) Year Ended December 31,
	2019			2018			2017
Amortization of treasury locks (included in interest    expense, net)	$	(18.2	)	$	(5.3	)	$	(5.7	)