Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2015

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Reconciliation Of The Benefit Obligation

The reconciliation of the benefit obligation is as follows:

	Pension Benefits						Other Benefits
	2015			2014			2015			2014
Benefit obligation at beginning of year	$	1,914.4		$	1,764.7		$	646.6		$	607.5
Service cost	13.1			13.0			2.1			3.2
Interest cost	68.2			74.1			23.4			26.3
Plan amendment	0.8			—			—			—
Actuarial (gain) loss	(41.2		)	185.4			(58.1		)	45.3
Benefits paid	(122.0		)	(122.8		)	(35.3		)	(35.7		)
Benefit obligation at end of year	$	1,833.3		$	1,914.4		$	578.7		$	646.6

Changes In The Fair Value Of Plan Assets

The changes in the fair value of plan assets are as follows:

	Pension Benefits						Other Benefits
	2015			2014			2015			2014
Fair value of plan assets at beginning of year	$	1,985.0		$	1,944.0		$	347.9		$	349.8
Actual return on plan assets	(1.5		)	160.2			(1.2		)	17.7
Employer contributions	3.7			3.6			17.3			16.1
Benefits paid	(122.0		)	(122.8		)	(35.6		)	(35.7		)
Fair value of plan assets at end of year	$	1,865.2		$	1,985.0		$	328.4		$	347.9

Net Amount Included In Consolidated Balance Sheets

The net amount included in the consolidated balance sheets is as follows:

	Pension Benefits						Other Benefits
	2015			2014			2015			2014
Noncurrent assets	$	103.4		$	146.3		$	—		$	—
Current liabilities	(10.5		)	(4.3		)	—			—
Noncurrent liabilities	(61.0		)	(71.4		)	(250.3		)	(298.7		)
Net amount at December 31	$	31.9		$	70.6		$	(250.3	)	$	(298.7	)

Net Amounts Included In Accumulated Other Comprehensive Loss (Income) That Have Not Been Recognized As Components Of Net Periodic Benefit Costs

The net amounts included in accumulated other comprehensive loss (income) that have not been recognized as components of net periodic benefit costs are as follows:

	Pension Benefits						Other Benefits
	2015			2014			2015			2014
Net actuarial loss	$	635.0		$	563.7		$	162.7		$	211.2
Prior service credit	(0.1		)	(2.2		)	(73.5		)	(88.0		)
Net amount before tax at December 31	$	634.9		$	561.5		$	89.2		$	123.2

Schedule Of Assumptions Used In Calculating The Benefit Obligations

The weighted-average assumptions used in calculating the benefit obligations for all plans are as follows:

	Pension Benefits				Other Benefits
	2015		2014		2015		2014
Discount rate	3.92	%	3.66	%	4.01	%	3.74	%
Rate of compensation increase	3.00	%	3.00	%	3.00	%	3.00	%
Expected rate of return on plan assets	7.84	%	7.62	%	7.00	%	7.00	%

Components Of Net Periodic Benefit Cost (Credit)

The components of net periodic benefit cost (benefit credit) included in the consolidated statements of income are as follows:

	2015			2014			2013
Pension Benefits
Service cost	$	13.1		$	13.0		$	14.2
Interest cost	68.2			74.1			67.8
Expected return on assets	(143.2		)	(137.5		)	(133.1		)
Recognized actuarial loss	25.7			21.0			28.3
Amortization of prior service credit	(0.6		)	(0.8		)	(0.8		)
Settlement loss	6.5			5.2			11.0
Net periodic benefit credit	$	(30.3	)	$	(25.0	)	$	(12.6	)
Other Benefits
Service cost	$	2.1		$	3.2		$	6.7
Interest cost	23.4			26.3			22.4
Expected return on assets	(23.7		)	(23.4		)	(22.1		)
Recognized actuarial loss	15.3			9.4			11.2
Amortization of prior service credit	(14.4		)	(14.4		)	(13.3		)
Net periodic benefit cost	$	2.7		$	1.1		$	4.9

Weighted-Average Assumptions Used In Calculating The Benefit Obligations For All Plans

The weighted-average assumptions used in calculating the net periodic benefit cost for all plans are as follows:

	2015		2014		2013
Pension Benefits
Discount rate	3.66	%	4.39	%	3.60	%
Rate of compensation increase	3.00	%	3.00	%	3.50	%
Expected rate of return on plan assets	7.62	%	7.66	%	7.91	%
Other Benefits
Discount rate	3.74	%	4.48	%	3.71	%
Rate of compensation increase	3.00	%	3.00	%	3.50	%
Expected rate of return on plan assets	7.00	%	7.00	%	7.00	%

Fair Values of Pension Benefit Assets and Other Benefit Assets by Asset Category and Level Inputs

The fair values of our pension benefit assets and other benefit assets by asset category and level inputs at December 31, 2015, excluding cash, investment income receivable and amounts due to/from brokers, resulting in a net asset of $3.4, are as follows (see Note 6, “Fair Value,” for additional information regarding the definition of level inputs):

	Level I		Level II		Level III		Total
December 31, 2015
Pension Benefit Assets:
Equity securities:
U.S. securities	$	542.8	$	4.4	$	—	$	547.2
Foreign securities	258.8		—		—		258.8
Mutual funds	34.7		—		—		34.7
Fixed maturity securities:
Government securities	176.6		—		—		176.6
Corporate securities	—		364.0		—		364.0
Asset-backed securities	—		141.1		—		141.1
Other types of investments:
Common and collective trusts	—		48.1		—		48.1
Partnership interests	—		—		117.1		117.1
Insurance company contracts	—		—		174.2		174.2
Total pension benefit assets	$	1,012.9	$	557.6	$	291.3	$	1,861.8
Other Benefit Assets:
Equity securities:
U.S. securities	$	16.8	$	0.3	$	—	$	17.1
Foreign securities	7.4		—		—		7.4
Mutual funds	36.6		—		—		36.6
Fixed maturity securities:
Government securities	3.8		—		—		3.8
Corporate securities	—		9.5		—		9.5
Asset-backed securities	—		7.7		—		7.7
Other types of investments:
Common and collective trusts	—		1.5		—		1.5
Partnership interests	—		—		1.5		1.5
Life insurance contracts	—		—		229.9		229.9
Investment in DOL 103-12 trust	—		13.4		—		13.4
Total other benefit assets	$	64.6	$	32.4	$	231.4	$	328.4

The fair values of our pension benefit assets and other benefit assets by asset category and level inputs at December 31, 2014, excluding cash, investment income receivable and amounts due to/from brokers, resulting in a net liability of $0.2, are as follows (see Note 6, “Fair Value,” for additional information regarding the definition of level inputs):

	Level I			Level II		Level III		Total
December 31, 2014
Pension Benefit Assets:
Equity securities:
U.S. securities	$	591.2		$	4.5	$	—	$	595.7
Foreign securities	246.2			—		—		246.2
Mutual funds	36.8			—		—		36.8
Fixed maturity securities:
Government securities	206.5			11.5		—		218.0
Corporate securities	—			373.6		—		373.6
Asset-backed securities	—			170.0		—		170.0
Other types of investments:
Common and collective trusts	—			37.1		—		37.1
Partnership interests	—			—		120.7		120.7
Insurance company contracts	—			—		187.7		187.7
Treasury futures contracts	(0.9		)	—		—		(0.9		)
Total pension benefit assets	$	1,079.8		$	596.7	$	308.4	$	1,984.9
Other Benefit Assets:
Equity securities:
U.S. securities	$	22.0		$	0.3	$	—	$	22.3
Foreign securities	9.5			—		—		9.5
Mutual funds	33.6			—		—		33.6
Fixed maturity securities:
Government securities	6.2			—		—		6.2
Corporate securities	—			10.0		—		10.0
Asset-backed securities	—			10.5		—		10.5
Other types of investments:
Common and collective trusts	—			1.4		—		1.4
Partnership interests	—			—		1.5		1.5
Life insurance contracts	—			—		238.4		238.4
Investment in DOL 103-12 trust	—			14.8		—		14.8
Total other benefit assets	$	71.3		$	37.0	$	239.9	$	348.2

Reconciliation Of The Beginning And Ending Balances Of Plan Assets Measured At Fair Value Using Level III Inputs

A reconciliation of the beginning and ending balances of plan assets measured at fair value using Level III inputs for the years ended December 31, 2015, 2014 and 2013 is as follows:

	Partnership Interests			Insurance Company Contracts			Life Insurance Contracts			Total
Year ended December 31, 2015
Beginning balance at January 1, 2015	$	122.2		$	187.7		$	238.4		$	548.3
Actual return on plan assets:
Relating to assets still held at the reporting date	(5.9		)	(5.7		)	(6.8		)	(18.4		)
Purchases	10.9			7.0			—			17.9
Sales	(8.6		)	(14.8		)	(1.7		)	(25.1		)
Ending balance at December 31, 2015	$	118.6		$	174.2		$	229.9		$	522.7
Year ended December 31, 2014
Beginning balance at January 1, 2014	$	160.3		$	197.4		$	230.0		$	587.7
Actual return on plan assets:
Relating to assets still held at the reporting date	(5.4		)	1.4			8.4			4.4
Purchases	8.4			11.6			—			20.0
Sales	(41.1		)	(22.7		)	—			(63.8		)
Ending balance at December 31, 2014	$	122.2		$	187.7		$	238.4		$	548.3
Year ended December 31, 2013
Beginning balance at January 1, 2013	$	177.7		$	202.5		$	203.7		$	583.9
Actual return on plan assets:
Relating to assets still held at the reporting date	2.2			(5.6		)	26.3			22.9
Purchases	15.6			9.5			—			25.1
Sales	(35.2		)	(9.0		)	—			(44.2		)
Ending balance at December 31, 2013	$	160.3		$	197.4		$	230.0		$	587.7

Estimated Future Payments For Pension Benefits And Postretirement Benefits

Our estimated future payments for pension benefits and postretirement benefits, which reflect expected future service, as appropriate, are as follows:

	Pension Benefits		Other Benefits
2016	$	157.5	$	41.1
2017	151.9		41.8
2018	150.4		42.4
2019	147.8		42.8
2020	146.5		42.6
2021 – 2025	637.1		201.8