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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Components of Accumulated Other Comprehensive Loss

Components of Accumulated other comprehensive (loss) income were as follows ($ in millions):

			December 31,
			2020						2019
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $11.6 million and $12.8 million at December 31, 2020 and 2019, respectively			$	(20.5)					$	(24.3)
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $2.8 million and $1.6 million at December 31, 2020 and 2019, respectively			(13.1)						(3.5)
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $10.1 million and $5.0 million at December 31, 2020 and 2019, respectively			(78.3)						(94.8)
Accumulated other comprehensive loss			$	(111.9)					$	(122.6)

Changes in the Components of Accumulated Other Comprehensive Loss

Changes in the components of Accumulated other comprehensive (loss) income were as follows ($ in millions):

			For the Years Ended December 31,
			2020																		2019																		2018
			Pre-tax						Tax						Net of Tax						Pre-tax						Tax						Net of Tax						Pre-tax						Tax						Net of Tax
Pension and OPEB liability adjustments			$	5.0					$	(1.2)					$	3.8					$	2.5					$	1.4					$	3.9					$	(0.9)					$	(2.4)					$	(3.3)
Derivative instrument adjustments			(10.8)						1.2						(9.6)						(2.9)						—						(2.9)						(2.4)						1.4						(1.0)
Unrealized foreign currency translation adjustments			11.5						5.0						16.5						(2.5)						3.4						0.9						(28.0)						(2.8)						(30.8)
Total			$	5.7					$	5.0					$	10.7					$	(2.9)					$	4.8					$	1.9					$	(31.3)					$	(3.8)					$	(35.1)

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Tabular disclosure of the components of accumulated other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900

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Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1
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