AOCI Rollforward (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The changes in accumulated other comprehensive loss by component are summarized below ($ in millions).

	Foreign Currency Translation Adjustments			Unrealized Gain (Loss) on Cash Flow Hedges		Unrealized Pension Costs				Total Accumulated Other Comprehensive Loss
Balance, December 31, 2016	$	(240.7	)	$	—	$	(7.0	)		$	(247.7	)
Other comprehensive income (loss) before reclassifications:
Increase (decrease)	251.6			—		(6.1		)		245.5
Income tax impact	—			—		1.6				1.6
Other comprehensive income (loss) before reclassifications, net of income taxes	251.6			—		(4.5		)		247.1
Amounts reclassified from accumulated other comprehensive income (loss):
Increase	—			—		1.6			(a)	1.6
Income tax impact	—			—		(0.4		)		(0.4		)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	—			—		1.2				1.2
Net current period other comprehensive income (loss), net of income taxes	251.6			—		(3.3		)		248.3
Balance, December 31, 2017	10.9			—		(10.3		)		0.6
Adoption of accounting standards	—			—		(0.2		)		(0.2		)
Balance, January 1, 2018	10.9			—		(10.5		)		0.4
Other comprehensive income (loss) before reclassifications:
(Decrease) increase	(85.2		)	—		10.2				(75.0		)
Income tax impact	—			—		(3.0		)		(3.0		)
Other comprehensive income (loss) before reclassifications, net of income taxes	(85.2		)	—		7.2				(78.0		)
Amounts reclassified from accumulated other comprehensive income (loss):
Decrease	—			—		(0.9		)	(a)	(0.9		)
Income tax impact	—			—		0.3				0.3
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	—			—		(0.6		)		(0.6		)
Net current period other comprehensive income (loss), net of income taxes	(85.2		)	—		6.6				(78.6		)
Balance, December 31, 2018	(74.3		)	—		(3.9		)		(78.2		)
Other comprehensive income (loss) before reclassifications:
(Decrease) increase	(46.6		)	0.1		(31.9		)		(78.4		)
Income tax impact	4.5			—		7.4				11.9
Other comprehensive (loss) income before reclassifications, net of income taxes	(42.1		)	0.1		(24.5		)		(66.5		)
Amounts reclassified from accumulated other comprehensive income (loss):
Increase	—			—		0.6			(a)	0.6
Income tax impact	—			—		(0.1		)		(0.1		)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	—			—		0.5				0.5
Net current period other comprehensive income (loss), net of income taxes	(42.1		)	0.1		(24.0		)		(66.0		)
Balance, December 31, 2019	$	(116.4	)	$	0.1	$	(27.9	)		$	(144.2	)

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^(a) 

This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost (refer to Note 10 for additional details).