Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2017

Share-based Compensation [Abstract]

Schedule of share-based compensation expense

Share-based compensation expense was as follows (in millions):

Year Ended				Six Months Ended		Year Ended
December 31, 2017		December 31, 2016		December 31, 2015		June 27, 2015
$	43.8	$	23.0	$	22.8	$	31.6

Schedule of share-based compensation, stock options, activity

A summary of activity related to stock options is presented below (options in thousands):

	Number of Options		Weighted-Average Exercise Price Per Share		Weighted- Average Remaining Term in Years	Aggregate Intrinsic Value
Options outstanding at December 31, 2015	783		$	99.93
Granted	344		$	126.67
Exercised	(122	)	$	67.68
Forfeited or expired	(256	)	$	126.54
Options outstanding at December 31, 2016	749		$	108.40	6.6	$	5.5
Granted	439		$	70.34
Exercised	(31	)	$	24.75
Forfeited or expired	(85	)	$	118.47
Options outstanding December 31, 2017	1,072		$	94.90	6.9	$	10.9
Options exercisable	519		$	107.14	5.0	$	3.8
Options expected to vest	533		$	83.63	8.7	$	6.8

Schedule of aggregate intrinsic value

The aggregate intrinsic value for options exercised was as follows (in millions):

Year Ended				Six Months Ended		Year Ended
December 31, 2017		December 31, 2016		December 31, 2015		June 27, 2015
$	1.7	$	5.2	$	6.7	$	20.7

Schedule of share-based payment award, stock options, valuation assumptions

The assumptions used in estimating the fair value of the RTSR performance share units granted during each year were as follows:

	Year Ended
	December 31, 2017
Dividend yield	0.9	%
Volatility, as a percent	36.1	%
Risk-free interest rate	1.4	%
Expected life in years	2.57

The fair values were estimated using the Black-Scholes option pricing model with the following weighted-average assumptions:

	Year Ended
	December 31, 2017		December 31, 2016		June 27, 2015
Dividend yield	0.9	%	0.5	%	0.3	%
Volatility, as a percent	30.0	%	27.6	%	27.1	%
Risk-free interest rate	1.8	%	1.3	%	1.7	%
Expected life in years	5.41		5.5		5.3

Schedule of nonvested RSUs

A summary of activity related to non-vested service-based restricted share units is presented below (units in thousands):

	Number of Non-vested Service- Based Share Units		Weighted- Average Grant Date Fair Value Per Share		Weighted- Average Remaining Term in Years	Aggregate Intrinsic Value
Non-vested service-based share units outstanding at December 31, 2015	382		$	154.07
Granted	298		$	113.26
Vested	(92	)	$	137.15
Forfeited	(120	)	$	151.64
Non-vested service-based share units outstanding at December 31, 2016	468		$	137.53	1.7	$	39.0
Granted	298		$	70.55
Vested	(112	)	$	128.86
Forfeited	(55	)	$	120.97
Non-vested service-based share units outstanding at December 31, 2017	599		$	107.26	1.5	$	52.2

Schedule of weighted average grant date fair value

The weighted-average fair value per share at the date of grant for performance-based restricted share units granted was as follows:

Year Ended				Six Months Ended		Year Ended
December 31, 2017		December 31, 2016		December 31, 2015		June 27, 2015
$	70.34	$	126.37	$	184.49	$	150.14

The weighted-average fair value per share at the date of grant for service-based restricted share units granted was as follows (in millions):

Year Ended				Six Months Ended		Year Ended
December 31, 2017		December 31, 2016		December 31, 2015		June 27, 2015
$	70.55	$	113.26	$	165.64	$	153.99

Schedule of total fair value of RSUs

The total fair value of service-based restricted share units that vested was as follows (in millions):

Year Ended				Six Months Ended		Year Ended
December 31, 2017		December 31, 2016		December 31, 2015		June 27, 2015
$	14.5	$	12.6	$	11.7	$	9.1

Schedule of nonvested PSUs

A summary of activity related to non-vested performance-based restricted share units is presented below (units in thousands):

	Number of Non-vested Performance- Based Share Units		Weighted- Average Grant Date Fair Value Per Share		Weighted- Average Remaining Term in Years*	Aggregate Intrinsic Value
Non-vested performance-based share units outstanding at December 31, 2015	223		$	146.31
Granted	159		$	126.37
Vested	(81	)	$	128.74
Forfeited	(124	)	$	143.64
Non-vested performance-based share units outstanding at December 31, 2016	177		$	138.29	1.7	$	14.8
Granted	191		$	70.34
Vested	(27	)	$	142.18
Forfeited	(38	)	$	130.34
Non-vested performance-based share units outstanding at December 31, 2017	303		$	93.65	2.0	$	26.5

A summary of activity related to non-vested RTSR performance share units is presented below (units in thousands):

	Number of Non-vested RTSR Performance Share Units	Weighted- Average Grant Date Fair Value Per Share		Weighted- Average Remaining Term in Years*	Aggregate Intrinsic Value
Non-vested RTSR performance share units outstanding at December 31, 2016	—	$	—	0	$	—
Granted	39	$	64.82
Non-vested RTSR performance share units outstanding at December 31, 2017	39	$	64.82	2.0	$	3.4

Schedule total fair value

The total fair value of performance-based restricted share units that vested was as follows (in millions):

Year Ended				Six Months Ended		Year Ended
December 31, 2017		December 31, 2016		December 31, 2015		June 27, 2015
$	3.8	$	10.4	$	6.4	$	5.1