Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2014

Compensation and Retirement Disclosure [Abstract]

Schedule of Components of Net Periodic Benefit Cost

The components of net periodic benefit cost and other amounts recognized in other comprehensive income were as follows:

	Pension benefits									Other retirement benefits
($ in millions)	2014			2013			2012			2014			2013			2012
Net periodic benefit cost:
Service cost	$	9.8		$	9.7		$	8.5		$	0.4		$	1.1		$	1.3
Interest cost	17.1			14.8			15.5			0.4			0.6			1.0
Expected return on assets	(19.3		)	(17.3		)	(16.4		)	—			—			—
Amortization of prior service (credit) cost	(1.3		)	(1.3		)	(1.4		)	—			—			0.1
Amortization of transition obligation	0.1			0.1			0.1			—			—			—
Amortization of actuarial loss (gain)	4.7			9.2			8.5			(1.6		)	(0.7		)	—
Net periodic benefit cost	$	11.1		$	15.2		$	14.8		$	(0.8	)	$	1.0		$	2.4
Other changes in plan assets and benefit obligations recognized in other comprehensive income, pre-tax:
Net loss (gain) arising during period	$	31.5		$	(36.1	)	$	16.5		$	0.1		$	(18.5	)	$	2.1
Amortization of prior service credit (cost)	1.3			1.3			1.4			—			—			(0.1		)
Amortization of transition obligation	(0.1		)	(0.1		)	(0.1		)	—			—			—
Amortization of actuarial (loss) gain	(4.7		)	(9.2		)	(8.5		)	1.6			0.7			—
Foreign currency exchange rate changes on the above line items	(2.1		)	0.6			0.8			—			—			—
Total recognized in other comprehensive income	$	25.9		$	(43.5	)	$	10.1		$	1.7		$	(17.8	)	$	2.0
Total recognized in net periodic benefit cost and other comprehensive income	$	37.0		$	(28.3	)	$	24.9		$	0.9		$	(16.8	)	$	4.4

Net periodic benefit cost by geographic location is as follows:

	Pension benefits						Other retirement benefits
	2014		2013		2012		2014			2013		2012
U.S. plans	$	8.1	$	11.9	$	12.0	$	(0.8	)	$	1.0	$	2.4
International plans	3.0		3.3		2.8		—			—		—
Net periodic benefit cost	$	11.1	$	15.2	$	14.8	$	(0.8	)	$	1.0	$	2.4

Schedule of Changes in Projected Benefit Obligation, Fair Value of Plan Assets and Funded Status

The following table presents the changes in the benefit obligation and the fair value of plan assets, as well as the funded status of the plans:

	Pension benefits						Other retirement benefits
($ in millions)	2014			2013			2014			2013
Change in benefit obligation:
Benefit obligation, January 1	$	(360.8	)	$	(363.2	)	$	(9.2	)	$	(26.0	)
Service cost	(9.8		)	(9.7		)	(0.4		)	(1.1		)
Interest cost	(17.1		)	(14.8		)	(0.4		)	(0.6		)
Participants' contributions	(0.9		)	(0.6		)	(0.6		)	(0.5		)
Actuarial (loss) gain	(44.5		)	12.9			(0.1		)	18.5
Benefits/expenses paid	28.8			16.4			0.6			0.5
Foreign currency translation	5.8			(1.8		)	—			—
Benefit obligation, December 31	$	(398.5	)	$	(360.8	)	$	(10.1	)	$	(9.2	)
Change in plan assets:
Fair value of assets, January 1	$	284.7		$	251.0		$	—		$	—
Actual return on assets	32.3			40.5			—			—
Employer contribution	35.4			8.2			—			—
Participants' contribution	0.9			0.6			0.6			0.5
Benefits/expenses paid	(28.8		)	(16.4		)	(0.6		)	(0.5		)
Foreign currency translation	(2.2		)	0.8			—			—
Fair value of assets, December 31	$	322.3		$	284.7		$	—		$	—
Funded status at end of year	$	(76.2	)	$	(76.1	)	$	(10.1	)	$	(9.2	)

Schedule of Amounts Recognized in Balance Sheet

Amounts recognized in the balance sheet were as follows:

	Pension benefits						Other retirement benefits
($ in millions)	2014			2013			2014			2013
Current liabilities	$	(1.8	)	$	(1.5	)	$	(0.8	)	$	(0.7	)
Noncurrent liabilities	(74.4		)	(74.6		)	(9.3		)	(8.5		)
	$	(76.2	)	$	(76.1	)	$	(10.1	)	$	(9.2	)

Schedule of Amounts Recognized in Other Comprehensive Income (Loss)

The amounts in accumulated other comprehensive loss, pre-tax, consisted of:

	Pension benefits						Other retirement benefits
($ in millions)	2014			2013			2014			2013
Net actuarial loss (gain)	$	120.1		$	95.2		$	(13.8	)	$	(15.5	)
Transition obligation	0.2			0.3			—			—
Prior service credit	(6.3		)	(7.4		)	—			—
Total	$	114.0		$	88.1		$	(13.8	)	$	(15.5	)

Schedule of Expected Benefit Payments

Benefit payments expected to be paid under our defined benefit pension and other retirement benefit plans in the next ten years are as follows:

($ in millions)	Domestic		International		Total
2015	$	21.5	$	1.6	$	23.1
2016	22.9		1.6		24.5
2017	24.4		1.8		26.2
2018	24.9		2.2		27.1
2019	25.8		2.4		28.2
2020 to 2024	135.5		15.1		150.6
	$	255.0	$	24.7	$	279.7

Schedule of Assumptions Used

Weighted average assumptions used to determine net periodic benefit cost were as follows:

	Pension benefits						Other retirement benefits
	2014		2013		2012		2014		2013		2012
Discount rate	4.50	%	3.99	%	4.78	%	4.55	%	3.50	%	4.50	%
Rate of compensation increase	4.29	%	4.24	%	4.29	%	—		—		—
Long-term rate of return on assets	7.01	%	7.12	%	7.37	%	—		—		—

Weighted average assumptions used to determine the benefit obligations were as follows:

	Pension benefits				Other retirement benefits
	2014		2013		2014		2013
Discount rate	3.96	%	4.82	%	3.90	%	4.55	%
Rate of compensation increase	4.14	%	4.37	%	—		—

Schedule of Allocation of Plan Assets

The weighted average asset allocations by asset category for our pension plans, at December 31, were as follows:

	2014		2013
Equity securities	63	%	66	%
Debt securities	35	%	32	%
Other	2	%	2	%
	100	%	100	%

The following are the U.S. target asset allocations and acceptable allocation ranges:

	Target allocation	Allocation range
Equity securities	65%	60%-70%
Debt securities	35%	30%-40%
Other	—%	0%-5%

The following tables present the fair value of our pension plan assets, utilizing the fair value hierarchy discussed in Note 10, Fair Value Measurements:

	Balance at
	December 31,		Basis of Fair Value Measurements
($ in millions)	2014		Level 1		Level 2		Level 3
Cash	$	1.1	$	1.1	$	—	$	—
Equity securities:
Indexed mutual funds	142.3		142.3		—		—
International mutual funds	58.7		58.7		—		—
Fixed income securities:
Mutual funds	111.4		111.4		—		—
Insurance contract	1.0		—		1.0		—
Balanced mutual fund	7.8		7.8		—		—
	$	322.3	$	321.3	$	1.0	$	—

	Balance at
	December 31,		Basis of Fair Value Measurements
($ in millions)	2013		Level 1		Level 2		Level 3
Cash	$	1.0	$	1.0	$	—	$	—
Equity securities:
Indexed mutual funds	132.6		132.6		—		—
International mutual funds	55.4		55.4		—		—
Fixed income securities:
Mutual funds	87.4		87.4		—		—
Insurance contract	1.2		—		1.2		—
Balanced mutual fund	7.1		7.1		—		—
	$	284.7	$	283.5	$	1.2	$	—