PENSION AND POSTRETIREMENT PLANS Pension and Postretirement Plans (Tables)

12 Months Ended

Dec. 31, 2018

Postemployment Benefits [Abstract]

Assumed Benefit Payments By Year [Text Block]

The following assumed benefit payments under the Company's post-retirement benefit plan, which reflect expected future service, as appropriate, and which were used in the calculation of projected benefit obligations, are expected to be paid as follows:

2019	$	0.9
2020	0.9
2021	0.9
2022	0.8
2023	0.7
Years 2024 and thereafter	2.4

Defined Benefit Plan Fair Value Of Plan Assets By Category [Table Text Block]

The weighted average expected long-term rate of return for the Company Plan’s assets is as follows:

	Target Allocation		Weighted Average Expected Long-Term Rate of Return
Equity securities	50.0	%	3.4	%
Fixed income securities	43.0	%	2.7	%
Other assets	7.0	%	0.4	%

The fair values of the Company Plan’s assets at December 31, 2018, and 2017, by asset category are as follows:

			Fair Value Measurements as of
			December 31, 2018
	Fair Value as of December 31, 2018		Using Fair Value Hierarchy
Asset Category			Level 1		Level 2		Level 3
Cash	$	7.8	$	7.8	$	—	$	—
Equity securities:
U.S. large cap - blend (a)	54.2		—		54.2		—
U.S. mid cap - blend (b)	20.4		—		20.4		—
U.S. small cap - blend (c)	6.5		—		6.5		—
International equity - blend (d)	36.5		—		36.5		—
Real estate (e)	11.8		—		11.8		—
Fixed income securities:
U.S. fixed income (f)	103.5		—		103.5		—
U.S inflation protection income (g)	6.4		—		6.4		—
Total fair value of the Company Plan’s assets	$	247.1	$	7.8	$	239.3	$	—

			Fair Value Measurements as of
			December 31, 2017
	Fair Value as of December 31, 2017		Using Fair Value Hierarchy
Asset Category			Level 1		Level 2		Level 3
Cash	$	7.4	$	7.4	$	—	$	—
Equity securities:
U.S. large cap - blend (a)	59.9		—		59.9		—
U.S. mid cap - blend (b)	23.6		—		23.6		—
U.S. small cap - blend (c)	7.7		—		7.7		—
International equity - blend (d)	39.1		—		39.1		—
Commodities index (h)	12.8		—		12.8		—
Fixed income securities:
U.S. fixed income (f)	107.0		—		107.0		—
U.S inflation protection income (g)	6.2		—		6.2		—
Total fair value of the Company Plan’s assets	$	263.7	$	7.4	$	256.3	$	—

a) This category represents an equity index fund not actively managed that tracks the S&P 500 Index.

b) This category represents an equity index fund not actively managed that tracks the S&P mid-cap 400 Index.

c) This category represents an equity index fund not actively managed that tracks the Russell 2000 Index.

d) This category represents an equity index fund not actively managed that tracks the MSCI ACWI ex USA Index.

e) This category represents a real estate index fund not actively managed that tracks the Vanguard REIT Index.

f) This category primarily represents bond index funds not actively managed that track the Northern Trust U.S. Aggregate Index as well as an actively managed strategy which utilizes the Metropolitan West Total Return Bond Index as its primary prospectus benchmark.

g) This category primarily represents a bond index fund not actively managed that tracks the Northern Trust U.S. TIPS Index.

h) This category represents a commodities index fund not actively managed that tracks the Dow Jones - UBS Commodity Index.

Schedule of Changes in Fair Value of Plan Assets [Table Text Block]

A summary of the changes in the fair value of plan assets follows:

	2018			2017
Fair value of plan assets at beginning of year	$	263.7		$	247.5
Actual return on plan assets	(14.3		)	29.2
Employer contributions	31.4			17.6
Benefits and administrative expenses paid	(30.0		)	(30.6		)
Fair value of plan assets at end of year	$	250.8		$	263.7

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

	Year ended December 31,
	2018			2017			2016
Service cost for benefits earned	$	—		$	—		$	—
Interest cost on benefit obligation	0.3			0.3			0.3
Net amortization and deferral	(1.3		)	(6.7		)	(15.9		)
Post-retirement medical plan costs	$	(1.0	)	$	(6.4	)	$	(15.6	)

A summary of the changes in the projected benefit obligations of the Company Plan and the PEP are summarized as follows:

	2018			2017
Balance at January 1	$	368.0		$	366.5
Service cost	5.2			5.5
Interest cost	13.0			14.4
Actuarial (gain) loss	(21.9		)	12.2
Benefits and administrative expenses paid	(30.0		)	(30.6		)
Merger of Covance SERP	$	4.2		$	—
Balance at December 31	$	338.5		$	368.0

The effect on operations for both the Company Plan and the PEP are summarized as follows:

	Year ended December 31,
	2018			2017			2016
Service cost for benefits earned	$	5.2		$	5.5		$	4.9
Interest cost on benefit obligation	13.0			14.4			15.5
Expected return on plan assets	(16.5		)	(16.3		)	(16.7		)
Net amortization and deferral	11.7			11.0			11.2
Settlements	7.5			—			—
Defined-benefit plan costs	$	20.9		$	14.6		$	14.9

A summary of the changes in the accumulated post-retirement benefit obligation follows:

	2018			2017
Balance at January 1	$	8.6		$	6.8
Interest cost on benefit obligation	0.3			0.3
Actuarial loss	(1.2		)	2.5
Benefits paid	(0.8		)	(1.0		)
Balance at December 31	$	6.9		$	8.6
Recorded as:
Accrued expenses and other	$	0.9		$	1.2
Other liabilities	6.0			7.4
	$	6.9		$	8.6

Schedule of Net Funded Status [Table Text Block]

he net funded status of the Company Plan and the PEP at December 31:

	2018		2017
Funded status	$	87.6	$	104.3
Recorded as:
Accrued expenses and other	$	2.1	$	2.2
Other liabilities	85.5		102.1
	$	87.6	$	104.3

Schedule of Assumptions Used [Table Text Block]

Weighted average assumptions used in the accounting for the Company Plan and the PEP are summarized as follows:

	2018		2017		2016
Discount rate	4.4	%	3.7	%	4.2	%
Expected long term rate of return	6.5	%	6.8	%	6.8	%

Schedule of Expected Benefit Payments [Table Text Block]

The following estimated benefit payments under the Company Plan and PEP, which were used in the calculation of projected benefit obligations, are expected to be paid as follows:

2019	$	28.2
2020	27.2
2021	26.7
2022	26.4
2023	25.8
Years 2024 and thereafter	117.2

	U.K. Plans		German Plan
2019	$	4.6	$	0.3
2020	4.9		0.5
2021	5.2		0.5
2022	6.4		0.6
2023	6.7		0.7
Years 2024 and thereafter	40.6		3.6