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Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Earnings Per Share [Abstract] |  |  |  |
Net income | $ 110.7 | $ 137.6 | $ 180.0 | $ 175.5
Add: Loss from discontinued operations | 0.3 | 1.6 | 0.4 | 1.6
Income from continuing operations | $ 111.0 | $ 139.2 | $ 180.4 | $ 177.1
Weighted-average shares outstanding – basic | 39.1 | 40.7 | 39.4 | 41.1
Add: Potential effect of dilutive securities attributable to stock-based payments | 0.4 | 0.4 | 0.4 | 0.5
Weighted-average shares outstanding – diluted | 39.5 | 41.1 | 39.8 | 41.6
Earnings per share – Basic: |  |  |  |
Income from continuing operations (in dollars per share) | $ 2.84 | $ 3.42 | $ 4.58 | $ 4.31
Loss from discontinued operations (in dollars per share) | (0.01) | (0.04) | (0.01) | (0.04)
Net income (in dollars per share) | 2.83 | 3.38 | 4.57 | 4.27
Earnings per share – Diluted: |  |  |  |
Income from continuing operations (in dollars per share) | 2.81 | 3.39 | 4.53 | 4.26
Loss from discontinued operations (in dollars per share) | (0.01) | (0.04) | (0.01) | (0.04)
Net income (in dollars per share) | $ 2.80 | $ 3.35 | $ 4.52 | $ 4.22

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1448-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration