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Employee plans (Tables)

12 Months Ended

Dec. 31, 2017

Defined Benefit Plan Disclosure [Line Items]

Fair Value Assumptions on Stock Options

The fair value of stock option awards granted in 2016 and 2015 was estimated using the Black-Scholes option pricing model with the following assumptions and weighted-average fair values as follows:

Year Ended December 31,		2016				2015
Weighted-average fair value of grant		$	4.53			$	8.92
Risk-free interest rate		1.29		%		1.28		%
Expected volatility		51.30		%		45.46		%
Expected life of options in years		4.90				4.92
Expected dividend yield		—				—

Summary of Stock Option Activity

A summary of stock option activity for the year ended December 31, 2017 follows (shares in thousands):

		Shares			Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Term (years)		Aggregate Intrinsic Value ($ in millions)
Outstanding at December 31, 2016		2,099			$	25.41
Granted		—			—
Exercised		(1	)		10.65
Forfeited and expired		(340	)		20.59
Outstanding at December 31, 2017		1,758			26.35				1.56		$	—
Expected to vest at December 31, 2017		198			23.20				3.42		$	—
Exercisable at December 31, 2017		1,558			26.76				1.33		$	—

Summary of Restricted Stock Unit Activity

A summary of restricted stock unit activity for the year ended December 31, 2017 follows (shares in thousands):

		Restricted Stock Units			Weighted-Average Grant-Date Fair Value
Outstanding at December 31, 2016		1,454			$	12.68
Granted		1,042			13.85
Vested		(555	)		13.31
Forfeited and expired		(253	)		11.88
Outstanding at December 31, 2017		1,688			13.39

Schedule of Accumulated Benefit Obligation in Excess of Plan Assets

Information for defined benefit retirement plans with an accumulated benefit obligation in excess of plan assets at December 31, 2017 and 2016 follows:

As of December 31,		2017				2016
Accumulated benefit obligation		$	7,151.7			$	7,551.8
Fair value of plan assets		5,227.0				5,357.2

Schedule of Projected Benefit Obligation in Excess of Plan Assets

Information for defined benefit retirement plans with a projected benefit obligation in excess of plan assets at December 31, 2017 and 2016 follows:

As of December 31,		2017				2016
Projected benefit obligation		$	7,153.4			$	7,555.2
Fair value of plan assets		5,227.0				5,357.2

Schedule of Weighted-Average Assumptions

Weighted-average assumptions used to determine benefit obligation at December 31 were as follows:

Year ended December 31,		2017			2016			2015
Discount rate		5.30	%		5.53	%		5.61	%

Company's Investment Policy Targets and Ranges for Each Asset Category

The company’s investment policy targets and ranges for each asset category are as follows:

		U.S.						International
Asset Category		Target			Range			Target			Range
Equity securities		58	%		52-64%			24	%		18-30%
Debt securities		36	%		33-39%			60	%		53-66%
Real estate		6	%		3-9%			1	%		0-3%
Cash		—	%		0-5%			1	%		0-5%
Other		—	%		—	%		14	%		7-21%

Assumed Health Care Cost Trend Rates

Assumed health care cost trend rates at December 31,		2017			2016
Health care cost trend rate assumed for next year		6.6	%		5.8	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)		4.8	%		4.8	%
Year that the rate reaches the ultimate trend rate		2023			2023

Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates

A one-percentage-point change in assumed health care cost trend rates would have the following effects:

		1-Percentage- Point Increase				1-Percentage- Point Decrease
Effect on service and interest cost		$	0.1			$	(0.1	)
Effect on postretirement benefit obligation		2.0				(1.7		)

Schedule of Plans' Assets (Liabilities) at Fair Value

The following table sets forth by level, within the fair value hierarchy, the plans’ assets (liabilities) at fair value at December 31, 2017.

		U.S. Plans																International Plans
As of December 31, 2017		Fair Value				Level 1				Level 2				Level 3				Fair Value				Level 1				Level 2				Level 3
Pension plans
Equity Securities
Common Stocks		$	1,465.1			$	1,461.9			$	3.2			$	—			$	—			$	—			$	—			$	—
Commingled Funds		584.4								584.4								84.0								84.0
Debt Securities
U.S. Govt. Securities		139.8				139.8
Other Fixed Income		830.6								830.6								254.1				2.6				251.5
Insurance Contracts																		135.8												135.8
Commingled Funds																		267.5								267.5
Real Estate
Real Estate Investment Trusts		113.5				113.5												1.4				0.4				1.0
Other
Derivatives		2.6				13.1				(10.5		)						1.2								1.2
Commingled Funds																		357.1								357.1
Pooled Funds		228.0								228.0								29.2								29.2
Cash		34.8				34.8												25.1				25.1
Receivables		58.1				58.1												19.9				19.9
Payables		(116.7		)		(116.7		)										(1.5		)		(1.5		)
Total plan assets in fair value hierarchy		$	3,340.2			$	1,704.5			$	1,635.7			$	—			$	1,173.8			$	46.5			$	991.5			$	135.8
Plan assets measured using NAV as a practical expedient(a):
Commingled Funds
Equity		$	—															$	780.7
Debt		19.8																837.7
Other		105.1																25.2
Private Real Estate		112.4																16.5
Private Equity		0.9																—
Total pension plan assets		$	3,578.4															$	2,833.9
Other postretirement plans
Insurance Contracts		$	7.6											$	7.6

^(a) Investments measured at fair value using NAV as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets.

The following table sets forth by level, within the fair value hierarchy, the plans’ assets (liabilities) at fair value at December 31, 2016.

		U.S. Plans																International Plans
As of December 31, 2016		Fair Value				Level 1				Level 2				Level 3				Fair Value				Level 1				Level 2				Level 3
Pension plans
Equity Securities
Common Stocks		$	1,443.1			$	1,438.3			$	4.8			$	—			$	—			$	—			$	—			$	—
Commingled Funds		517.9								517.9								76.0								76.0
Debt Securities
U.S. Govt. Securities		158.5				158.5
Other Fixed Income		812.4								812.4								241.4				0.5				240.9
Insurance Contracts																		116.2												116.2
Commingled Funds																		242.8								242.8
Real Estate
Real Estate Investment Trusts		156.2				156.2												1.6				1.2				0.4
Other
Derivatives		3.1				(1.1		)		4.2								4.9								4.9
Commingled Funds																		294.5								294.5
Pooled Funds		272.0								272.0								6.7								6.7
Cash		12.2				12.2												11.4				11.4
Receivables		107.2				107.2
Payables		(195.3		)		(195.3		)
Total plan assets in fair value hierarchy		$	3,287.3			$	1,676.0			$	1,611.3			$	—			$	995.5			$	13.1			$	866.2			$	116.2
Plan assets measured using NAV as a practical expedient(a):
Commingled Funds
Equity		$	—															$	726.7
Debt		18.6																640.0
Other		104.6																25.8
Private Real Estate		40.5																41.7
Private Equity		1.1																—
Total pension plan assets		$	3,452.1															$	2,429.7
Other postretirement plans
Insurance Contracts		$	7.9											$	7.9

^(a) Investments measured at fair value using NAV as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets.

Summary of Changes in the Fair Value of the Plans' Level 3 Assets

The following table sets forth a summary of changes in the fair value of the plans’ Level 3 assets for the year ended December 31, 2017.

		January 1, 2017				Realized gains (losses)				Purchases or acquisitions				Sales or dispositions				Currency and unrealized gains (losses) relating to instruments still held at December 31, 2017				December 31, 2017
U.S. plans
Other postretirement plans
Insurance Contracts		$	7.9			$	(0.2	)		$	0.2			$	(0.3	)		$	—			$	7.6
International pension plans
Insurance Contracts		$	116.2			$	—			$	10.8			$	(11.4	)		$	20.2			$	135.8

The following table sets forth a summary of changes in the fair value of the plans’ Level 3 assets for the year ended December 31, 2016.

		January 1, 2016				Realized gains (losses)				Purchases or acquisitions				Sales or dispositions				Currency and unrealized gains (losses) relating to instruments still held at December 31, 2016				December 31, 2016
U.S. plans
Other postretirement plans
Insurance Contracts		$	7.7			$	(0.3	)		$	0.5			$	—			$	—			$	7.9
International pension plans
Insurance Contracts		$	120.6			$	—			$	4.7			$	(11.0	)		$	1.9			$	116.2

Schedule of Additional Information About Plan Assets Valued Using Net Asset Value

The following table presents additional information about plan assets valued using the net asset value as a practical expedient within the fair value hierarchy table.

		2017												2016
		Fair Value				Unfunded Commit-ments				Redemption Frequency		Redemption Notice Period Range		Fair Value				Unfunded Commit-ments				Redemption Frequency		Redemption Notice Period Range
U.S. plans
Commingled Funds
Debt		$	19.8			$	—			Daily		5 days		$	18.6			$	—			Daily		5 days
Other		105.1				—				Monthly		5 days		104.6				—				Monthly		5 days
Private Real Estate(a)		112.4				—				Quarterly		Up to 90 days		40.5				—				Quarterly		60 days
Private Equity(b)		0.9				—								1.1				—
Total		$	238.2			$	—							$	164.8			$	—
International pension plans
Commingled Funds
Equity		$	780.7			$	—			Weekly, Monthly		Up to 30 days		$	726.7			$	—			Weekly, Monthly		Up to 90 days
Debt		837.7				—				Weekly, Biweekly, Bimonthly, Monthly		Up to 30 days		640.0				—				Weekly, Biweekly, Bimonthly, Monthly		Up to 90 days
Other		25.2				—				Monthly		Up to 30 days		25.8				—				Monthly, Quarterly		Up to 90 days
Private Real Estate		16.5				—				Monthly		Up to 90 days		41.7				—				Monthly, Quarterly		Up to 90 days
Total		$	1,660.1			$	—							$	1,434.2			$	—

^(a) Includes investments in private real estate funds and limited partnerships. The funds invest in U.S. real estate and allow redemptions quarterly, though queues, restrictions, and gates may extend the period. The limited partnerships include investments in primarily U.S. real estate, and can never be redeemed. The partnerships are all currently being wound up, and are expected to make all distributions over the next three years.

^(b) Includes investments in limited partnerships, which invest primarily in U.S. buyouts and venture capital. The investments can never be redeemed. The partnerships are all currently being wound up, and are expected to make all distributions over the next three years.

Pension Plans

Defined Benefit Plan Disclosure [Line Items]

Funded Status of the Plan and Amounts Recognized in Consolidated Balance Sheet

Retirement plans’ funded status and amounts recognized in the company’s consolidated balance sheets at December 31, 2017 and 2016 follows:

		U.S. Plans								International Plans
As of December 31,		2017				2016				2017				2016
Change in projected benefit obligation
Benefit obligation at beginning of year		$	4,972.0			$	5,231.4			$	3,076.2			$	2,987.8
Service cost		—				—				5.1				7.4
Interest cost		211.3				231.3				72.8				87.8
Plan participants’ contributions		—				—				1.9				2.3
Plan amendment		—				—				(52.5		)		—
Plan curtailment		—				—				(2.2		)		(3.7		)
Actuarial loss (gain)		177.0				87.2				(93.8		)		502.2
Benefits paid		(358.7		)		(577.9		)		(117.1		)		(110.0		)
Foreign currency translation adjustments		—				—				299.3				(397.6		)
Benefit obligation at end of year		$	5,001.6			$	4,972.0			$	3,189.7			$	3,076.2
Change in plan assets
Fair value of plan assets at beginning of year		$	3,452.1			$	3,759.4			$	2,429.7			$	2,496.8
Actual return on plan assets		424.0				211.8				172.3				287.7
Employer contribution		61.0				58.8				77.4				73.7
Plan participants’ contributions		—				—				1.9				2.3
Benefits paid		(358.7		)		(577.9		)		(117.1		)		(110.0		)
Foreign currency translation and other adjustments		—				—				269.7				(320.8		)
Fair value of plan assets at end of year		$	3,578.4			$	3,452.1			$	2,833.9			$	2,429.7
Funded status at end of year		$	(1,423.2	)		$	(1,519.9	)		$	(355.8	)		$	(646.5	)
Amounts recognized in the consolidated balance sheets consist of:
Prepaid postretirement assets		$	—			$	—			$	147.4			$	31.9
Other accrued liabilities		(6.8		)		(6.7		)		(0.2		)		(0.2		)
Long-term postretirement liabilities		(1,416.4		)		(1,513.2		)		(503.0		)		(678.2		)
Total funded status		$	(1,423.2	)		$	(1,519.9	)		$	(355.8	)		$	(646.5	)
Accumulated other comprehensive loss, net of tax
Net loss		$	2,690.6			$	2,828.8			$	1,067.8			$	1,144.7
Prior service credit		$	(39.8	)		$	(42.4	)		$	(69.8	)		$	(27.7	)
Accumulated benefit obligation		$	5,001.6			$	4,972.0			$	3,188.0			$	3,072.1

Components of Net Periodic Cost

Net periodic pension cost (income) for 2017, 2016 and 2015 includes the following components:

		U.S. Plans												International Plans
Year ended December 31,		2017				2016				2015				2017				2016				2015
Service cost		$	—			$	—			$	—			$	5.1			$	7.4			$	8.7
Interest cost		211.3				231.3				224.1				72.8				87.8				94.1
Expected return on plan assets		(235.2		)		(253.1		)		(254.8		)		(127.5		)		(139.5		)		(155.4		)
Amortization of prior service credit		(2.5		)		(2.5		)		(2.4		)		(2.4		)		(3.0		)		(1.9		)
Recognized net actuarial loss		126.4				116.0				132.7				49.8				40.3				63.6
Curtailment gain		—				—				—				(5.4		)		(2.0		)		—
Net periodic pension cost (income)		$	100.0			$	91.7			$	99.6			$	(7.6	)		$	(9.0	)		$	9.1

Schedule of Weighted-Average Assumptions

Weighted-average assumptions used to determine net periodic pension cost for the years ended December 31 were as follows:

		U.S. Plans									International Plans
Year ended December 31,		2017			2016			2015			2017			2016			2015
Discount rate		4.38	%		4.56	%		4.09	%		2.34	%		3.30	%		3.05	%
Rate of compensation increase		N/A			N/A			N/A			1.66	%		1.66	%		1.68	%
Expected long-term rate of return on assets		6.80	%		6.80	%		6.80	%		5.30	%		5.99	%		6.45	%
Weighted-average assumptions used to determine benefit obligations at December 31 were as follows:
Discount rate		3.87	%		4.38	%		4.56	%		2.24	%		2.34	%		3.30	%
Rate of compensation increase		N/A			N/A			N/A			1.55	%		1.66	%		1.68	%

Expected Future Benefit Payments

As of December 31, 2017, the following benefit payments, which reflect expected future service where applicable, are expected to be paid from the defined benefit pension plans:

Year ending December 31,		U.S.				International
2018		$	364.4			$	98.7
2019		361.4				102.8
2020		359.3				106.9
2021		357.6				110.3
2022		355.1				117.5
2023 - 2027		1,693.6				642.5

Other Postretirement Benefit Plans

Defined Benefit Plan Disclosure [Line Items]

Funded Status of the Plan and Amounts Recognized in Consolidated Balance Sheet

A reconciliation of the benefit obligation, fair value of the plan assets and the funded status of the postretirement benefit plan at December 31, 2017 and 2016, follows:

As of December 31,		2017				2016
Change in accumulated benefit obligation
Benefit obligation at beginning of year		$	120.1			$	131.5
Service cost		0.5				0.4
Interest cost		5.6				6.2
Plan participants’ contributions		3.5				3.8
Amendments		(7.4		)		(3.3		)
Actuarial gain		(4.3		)		(1.4		)
Federal drug subsidy		0.3				1.4
Benefits paid		(15.7		)		(16.9		)
Foreign currency translation and other adjustments		0.6				(1.6		)
Benefit obligation at end of year		$	103.2			$	120.1
Change in plan assets
Fair value of plan assets at beginning of year		$	7.9			$	7.7
Actual return on plan assets		(0.3		)		(0.3		)
Employer contributions		12.2				13.6
Plan participants’ contributions		3.5				3.8
Benefits paid		(15.7		)		(16.9		)
Fair value of plan assets at end of year		$	7.6			$	7.9
Funded status at end of year		$	(95.6	)		$	(112.2	)
Amounts recognized in the consolidated balance sheets consist of:
Prepaid postretirement assets		$	0.9			$	1.4
Other accrued liabilities		(11.5		)		(12.4		)
Long-term postretirement liabilities		(85.0		)		(101.2		)
Total funded status		$	(95.6	)		$	(112.2	)
Accumulated other comprehensive loss, net of tax
Net loss		$	14.9			$	19.0
Prior service credit		(9.8		)		(3.2		)

Components of Net Periodic Cost

Net periodic postretirement benefit cost for 2017, 2016 and 2015, follows:

Year ended December 31,		2017				2016				2015
Service cost		$	0.5			$	0.4			$	0.6
Interest cost		5.6				6.2				6.9
Expected return on assets		(0.5		)		(0.4		)		(0.4		)
Amortization of prior service cost		(0.7		)		—				1.1
Recognized net actuarial loss		0.8				0.5				1.8
Net periodic benefit cost		$	5.7			$	6.7			$	10.0

Schedule of Weighted-Average Assumptions

Weighted-average assumptions used to determine net periodic postretirement benefit cost for the years ended December 31 were as follows:

Year ended December 31,		2017			2016			2015
Discount rate		5.53	%		5.61	%		5.27	%
Expected return on plan assets		5.50	%		5.50	%		5.50	%

Expected Future Benefit Payments

As of December 31, 2017, the following benefits are expected to be paid to or from the company’s postretirement plan:

Year ending December 31,		Gross Medicare Part D Receipts				Gross Expected Payments
2018		$	0.1			$	12.7
2019		—				10.5
2020		—				10.0
2021		—				9.4
2022		—				8.8
2023 – 2027		—				34.4

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Tabular disclosure of the aggregate benefit obligation and aggregate fair value of plan assets for pension plans and/or other employee benefit plans with benefit obligations in excess of plan assets as of the measurement date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920

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- Definition

Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (m)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(4)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
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- Definition

Tabular disclosure of the assumed health care cost trend rates for the next year used to measure the expected cost of benefits covered by the plans, including the ultimate trend rate(s) and when that rate is expected to be achieved.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
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- Definition

Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
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- Definition

Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
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- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-Subparagraph (e)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
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