Earnings Per Share (Narrative) (Details) - shares shares in Millions |
9 Months Ended | |
---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
|
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Antidilutive securities excluded from computation of earnings per share (in shares) | 0.0 | |
Contingently issuable share excluded | 0.1 | 0.2 |
Performance Shares [Member] | ||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Antidilutive securities excluded from computation of earnings per share (in shares) | 0.0 |