Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2021

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Gains or Losses Recognized in AOCI for the Cash Flow Hedges

The following tables provide information concerning gains or losses recognized in AOCL for the cash flow hedges for the three and six months ended June 30, 2021 and 2020:

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
	Interest		Interest		Interest		Interest
$ in millions (net of tax)	Rate Hedge		Rate Hedge		Rate Hedge		Rate Hedge
Beginning accumulated derivative gains in AOCL	$	13.4	$	13.9	$	13.6	$	14.5
Net gains / (losses) associated with current period hedging transactions	—		0.2		—		(0.1)
Net gains reclassified to earnings
Interest expense	(0.2)		(0.2)		(0.4)		(0.5)
Ending accumulated derivative gains in AOCL	$	13.2	$	13.9	$	13.2	$	13.9
Portion expected to be reclassified to earnings in the next twelve months	$	(0.8)

Subsidiaries [Member]

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Gains or Losses Recognized in AOCI for the Cash Flow Hedges

The following tables provide information concerning gains or losses recognized in AOCL for the cash flow hedges for the three and six months ended June 30, 2020:

	Three months ended		Six months ended
	June 30, 2020		June 30, 2020
	Interest		Interest
$ in millions (net of tax)	Rate Hedge		Rate Hedge
Beginning accumulated derivative losses in AOCL	$	(0.8)	$	(0.4)
Net gains / (losses) associated with current period hedging transactions	0.2		(0.1)
Net gains reclassified to earnings
Interest expense	(0.1)		(0.2)
Ending accumulated derivative losses in AOCL	$	(0.7)	$	(0.7)