Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2017

Stock-Based Compensation Plans

Stock-Based Compensation Disclosures (Table)

	For the year ended December 31,
	2017		2016		2015
	(in millions)
Compensation cost	$	80.6	$	73.8	$	69.7
Related income tax benefit		27.1		21.5		22.5
Capitalized as part of an asset		2.5		2.8		2.2

Nonqualified Stock Options Status (Table)

	Number of options		Weighted- average exercise price		Intrinsic value
	(in millions)				(in millions)
Options outstanding as of January 1, 2017		7.5	$	44.61
Granted		0.7		62.78
Exercised		2.9		46.07
Expired		1.0		62.59
Options outstanding as of December 31, 2017		4.3	$	42.65	$	120.3
Options vested or expected to vest as of December 31, 2017		4.3	$	42.62	$	120.1
Options exercisable as of December 31, 2017		2.7	$	38.74	$	88.1

Nonqualified Stock Options Remaining Contractual Lives and Range of Exercise Prices (Table)

Range of exercise prices	Number of options outstanding		Weighted- average remaining contractual life
	(in millions)
$11.07 - $21.69		0.1		1.2
$21.70 - $32.32		1.0		4.6
$32.33 - $42.95		1.2		7.5
$42.96 - $53.58		1.0		6.7
$53.59 - $64.22		1.0		6.7
$11.07 - $64.22		4.3		6.3

Nonqualified Stock Options Fair Value (Table)

	For the year ended December 31,
Options	2017			2016			2015
Expected volatility		27.6	%		31.7	%		52.2	%
Expected term (in years)		7.0			6.5			6.5
Risk-free interest rate		2.2	%		1.5	%		1.8	%
Expected dividend yield		2.87	%		4.07	%		2.81	%
Weighted average estimated fair value	$	15.31		$	8.91		$	20.43

Nonvested Performance Share Awards Activity (Table)

	Number of performance share awards		Weighted- average grant-date fair value
	(in millions)
Nonvested performance share awards as of January 1, 2017		0.9	$	44.23
Granted		0.2		62.98
Vested		0.3		44.88
Nonvested performance share awards as of December 31, 2017		0.8	$	48.82

Nonvested Restricted Stock Units Activity (Table)

	Number of restricted stock units		Weighted- average grant-date fair value
	(in millions)
Nonvested restricted stock units as of January 1, 2017		3.0	$	43.77
Granted		0.8		62.85
Vested		0.9		45.46
Canceled		0.1		46.81
Nonvested restricted stock units as of December 31, 2017		2.8	$	48.70