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Accounting for Share-Based Compensation 5 (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Capitalized share-based compensation costs $ 0 $ 0  
Stock options issued 1.0 1.0  
Computation of expected life, Simplified method The Company’s computation of expected life was determined based on the simplified method (the average of the vesting period and option term).    
Employee Stock Purchase Plan (ESPP)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares issued under ESPP     0.1
Share price issued under ESPP (in dollars per share)     $ 32.75
Number of shares available for future issuances under ESPP 28.9   28.9