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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions Principal weighted average assumptions used in applying the Black-Scholes model were as follows:
 
 
2018 Grants
 
2017 Grants
 
2016 Grants
Expected Term
 
6.0 years

 
6.0 years

 
6.0 years

Volatility
 
20.27
%
 
21.75
%
 
21.63
%
Dividend Yield
 
—

 
—

 
—

Discount Rate
 
2.66
%
 
2.03
%
 
1.45
%
Schedule of Stock Options Roll Forward A summary of stock option award activity as of and for the year ended December 31, 2018 is presented below:
 
 
Awards
(in millions)
 
Weighted-
Average
Exercise
Price
 
Aggregate
Intrinsic
Value
 (in millions)
 
Weighted
Average
Remaining
Contractual
Life (years)
Outstanding at December 31, 2017
 
8.1

 
$
16.54

 
 
 
 
Granted
 
1.1

 
$
29.74

 
 
 
 
Exercised
 
(1.7
)
 
$
10.52

 
 
 
 
Forfeited
 
(0.3
)
 
$
29.59

 
 
 
 
Outstanding at December 31, 2018
 
7.2

 
$
19.32

 
 
 
 
Vested and expected to vest at December 31, 2018
 
7.2

 
$
19.32

 
$
48.0

 
5.76
Exercisable at December 31, 2018
 
5.6

 
$
16.80

 
$
48.0

 
5.08
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] A summary of restricted stock and restricted stock unit award activity as of December 31, 2018 is presented below:
 
 
Awards
(in millions)
 
Weighted-Average
Fair Value
Outstanding at December 31, 2017
 
1.9

 
$
29.32

Granted
 
1.1

 
$
29.61

Vested
 
(1.2
)
 
$
29.84

Forfeited
 
(0.2
)
 
$
29.33

Outstanding at December 31, 2018
 
1.6

 
$
29.12
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block] A summary of PSA activity as of December 31, 2018 is presented below:
 
 
Awards
(in millions)
 
Weighted-Average
Fair Value
Outstanding at December 31, 2017
 
0.6

 
$
31.17

Granted
 
0.3

 
$
33.81

Vested
 
—

 
$
—

Forfeited
 
(0.1
)
 
$
33.65

Outstanding at December 31, 2018
 
0.8

 
$
31.82