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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
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:
 
2014 Grants
2013 Grants
Expected Term
7.81 years

7.81 years

Volatility
28.28
%
28.61
%
Dividend Yield
—

—

Discount Rate
2.21
%
2.13
%
Schedule of Stock Options Roll Forward
A summary of stock option award activity as of December 31, 2014 and changes during the year then ended, is presented below:
 
Awards (millions)
Weighted-
Average
Exercise
Price
Aggregate
Intrinsic
Value
 (millions)
Weighted
Average
Remaining
Contractual
Life (years)
Outstanding at January 1, 2014
16.2

$
9.32

 
 
Granted
1.6

$
9.62

 
 
Exercised
(0.4
)
$
8.03

 
 
Forfeited
(0.3
)
$
9.32

 
 
Outstanding at December 31, 2014
17.1

$
9.38

 
 
Vested and expected to vest at December 31, 2014
17.1

$
9.38

$
284.5

8.58
Exercisable at December 31, 2014
2.9

$
9.49

$
47.6

8.44