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Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2018

Defined Contribution Plan Disclosure [Line Items]

Defined Contribution Plan Disclosures [Table Text Block]

The table below provides detail of employer contributions for these plans.

	Year Ended December 31,
($ in millions)	2018			2017		2016
Employer contributions (US employees)	$	28.8		27.8		23.4
Employer contributions (non-US employees)	30.7			25.5		27.2

Schedule of Net Funded Status

The following table provides the projected benefit obligation and plan assets, the net of which represents our funded status, as well as the accumulated benefit obligations of our defined benefit pension plans.

	Year Ended December 31,
($ in millions)	2018			2017
Projected benefit obligation	$	365.6		402.2
Fair value of plan assets	384.3			408.9
Funded status and net amount recognized	18.7			6.7
Accumulated benefit obligation	$	365.6		402.2

Schedule of Amounts Recognized in Balance Sheet

Defined benefit pension plan amounts recorded in the Consolidated Balance Sheets are presented in the below table.

	December 31,
($ in millions)	2018			2017
Pension assets (included in Other assets)	$	25.2		22.4
Pension liabilities (included in Other liabilities)	(6.5		)	(15.7	)
Net asset recognized	$	18.7		6.7
Accumulated other comprehensive loss	$	84.7		92.2

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Tabular disclosure of defined contribution pension plans or defined contribution other postretirement plans, separately for pension plans and other postretirement benefit plans.

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