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Share-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation [Abstract]  
Schedule of share-based compensation expense Share-based compensation expense was as follows (in millions):
Year Ended
December 31,
2018
 
December 31,
2017
 
December 31,
2016
$
37.7

 
$
43.8

 
$
23.0
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, 2016
749

 
$
108.40

 
 
 
 
Granted
439

 
$
70.34

 
 
 
 
Exercised
(31
)
 
$
24.75

 
 
 
 
Forfeited or expired
(85
)
 
$
118.47

 
 
 
 
Options outstanding at December 31, 2017
1,072

 
$
94.90

 
6.9
 
$
10.9

Granted
521

 
$
82.43

 
 
 
 
Exercised
(33
)
 
$
42.06

 
 
 
 
Forfeited or expired
(26
)
 
$
97.82

 
 
 
 
Options outstanding December 31, 2018
1,534

 
$
91.56

 
6.9
 
$
0.1

Options exercisable
764

 
$
101.27

 
5.6
 
$
0.1

Options expected to vest
736

 
$
82.12

 
8.1
 
$
0.0
Schedule of aggregate intrinsic value The aggregate intrinsic value for options exercised was as follows (in millions):
Year Ended
December 31,
2018
 
December 31,
2017
 
December 31,
2016
$
1.1

 
$
1.7

 
$
5.2
Schedule of share-based payment award, stock options, valuation assumptions The fair value was estimated using the Black-Scholes option pricing model with the following weighted-average assumptions: 
 
Year Ended
 
December 31,
2018
 
December 31,
2017
 
December 31,
2016
Dividend yield
0.8
%
 
0.9
%
 
0.5
%
Volatility, as a percent
31.2
%
 
30.0
%
 
27.6
%
Risk-free interest rate
2.8
%
 
1.8
%
 
1.3
%
Expected life in years
5.6

 
5.4

 
5.5

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,
2018
 
December 31,
2017
Dividend yield
0.9
%
 
0.9
%
Volatility, as a percent
35.3
%
 
36.1
%
Risk-free interest rate
2.4
%
 
1.4
%
Expected life in years
2.8

 
2.6
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, 2016
468

 
$
137.53

 
 
 
 
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

Granted
385

 
$
81.51

 
 
 
 
Vested
(204
)
 
$
121.10

 
 
 
 
Forfeited
(52
)
 
$
107.31

 
 
 
 
Non-vested service-based share units outstanding at December 31, 2018
728

 
$
89.47

 
1.4
 
$
28.2
Schedule of weighted average grant date fair value 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
December 31,
2018
 
December 31,
2017
 
December 31,
2016
$
81.51

 
$
70.55

 
$
113.26

The weighted-average fair value per share at the date of grant for performance-based restricted share units granted was as follows:
Year Ended
December 31,
2018
 
December 31,
2017
 
December 31,
2016
$
85.01

 
$
70.34

 
$
126.37

The weighted-average fair value per share at the date of grant for RTSR performance share units granted was as follows:
Year Ended
December 31,
2018
 
December 31,
2017
$
101.13

 
$
64.82

The weighted-average fair value per share at the grant date for options granted was as follows:
Year Ended
December 31,
2018
 
December 31,
2017
 
December 31,
2016
$
24.43

 
$
19.50

 
$
33.53
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
December 31,
2018
 
December 31,
2017
 
December 31,
2016
$
24.6

 
$
14.5

 
$
12.6
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, 2016
177

 
$
138.29

 
 
 
 
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

Granted
207

 
$
85.01

 
 
 
 
Vested
(13
)
 
$
176.59

 
 
 
 
Forfeited
(55
)
 
$
85.94

 
 
 
 
Non-vested performance-based share units outstanding at December 31, 2018
442

 
$
86.61

 
1.5
 
$
17.2

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
—

 
$
—

 
 
 
 
Granted
39

 
$
64.82

 
 
 
 
Non-vested RTSR performance share units outstanding at December 31, 2017
39

 
$
64.82

 
2.0
 
$
3.4

Granted
38

 
$
101.13

 
 
 
 
Forfeited
(15
)
 
$
101.13

 
 
 
 
Non-vested RTSR performance share units outstanding at December 31, 2018
62

 
$
78.35

 
1.7
 
$
2.4
Schedule total fair value The total fair value of performance-based restricted share units that vested was as follows (in millions):
Year Ended
December 31,
2018
 
December 31,
2017
 
December 31,
2016
$
2.4

 
$
3.8

 
$
10.4