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Earnings Per Share and Common Stock (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Reconciliation of Basic and Diluted Earnings Per Share [Table Text Block] |
|  |  | 2018 |  |  |  |  |  | 2017 |  |
Reconciliation of Basic and Diluted |  |  | Dilutive |  |  |  |  |  | Dilutive |  |
Earnings Per Share | Basic |  | Securities |  | Diluted |  | Basic |  | Securities |  | Diluted
Millions Except Per Share Amounts |  |  |  |  |  |  |  |  |  |  |
Quarter ended June 30, |  |  |  |  |  |  |  |  |  |  |
Net Income |  | $31.3 |  |  |  |  |  | $31.3 |  |  |  | $36.9 |  |  |  |  |  | $36.9 |
Average Common Shares | 51.3 |  |  | 0.2 |  |  | 51.5 |  |  | 50.9 |  |  | 0.2 |  |  | 51.1 |
Earnings Per Share |  | $0.61 |  |  |  |  |  | $0.61 |  |  |  | $0.73 |  |  |  |  |  | $0.72 |
Six Months Ended June 30, |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  | $82.3 |  |  |  |  |  | $82.3 |  |  |  | $85.9 |  |  |  |  |  | $85.9 |
Average Common Shares | 51.2 |  |  | 0.2 |  |  | 51.4 |  |  | 50.5 |  |  | 0.2 |  |  | 50.7 |
Earnings Per Share |  | $1.61 |  |  |  |  |  | $1.60 |  |  |  | $1.70 |  |  |  |  |  | $1.69 |

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- References No definition available. + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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