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Income (Loss) from Continuing Operations Per Unrestricted Share (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Schedule of Basic and Diluted Earnings Per Share [Line Items] |  |  |  |
Income from Continuing Operations | $ 92.3 | $ 47.8 | $ 183.4 | $ 84.0
Dilutive Effect on Income of Equity-based Compensation Equivalent Shares | 0.0 | 0.0 | 0.0 | 0.0
Diluted Income from Continuing Operations Attributed to Unrestricted Shares | $ 91.9 | $ 47.4 | $ 182.4 | $ 83.4
Weighted-Average Unrestricted Shares Outstanding (shares) | 64,580,400 | 51,366,800 | 55,925,700 | 51,308,700
Equity-based Compensation Equivalent Shares (shares) | 769,100 | 199,600 | 569,800 | 171,600
Weighted-Average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution (shares) | 65,349,500 | 51,566,400 | 56,495,500 | 51,480,300
Basic Income from Continuing Operations Per Unrestricted Share | $ 1.42 | $ 0.92 | $ 3.26 | $ 1.63
Diluted Income from Continuing Operations Per Unrestricted Share | $ 1.40 | $ 0.92 | $ 3.23 | $ 1.62
Unrestricted Shares [Member] |  |  |  |
Schedule of Basic and Diluted Earnings Per Share [Line Items] |  |  |  |
Income from Continuing Operations | $ 91.9 | $ 47.4 | $ 182.4 | $ 83.4
Participating Awards [Member] |  |  |  |
Schedule of Basic and Diluted Earnings Per Share [Line Items] |  |  |  |
Income from Continuing Operations | $ 0.4 | $ 0.4 | $ 1.0 | $ 0.6

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- Definition Income or loss from continuing operations available to common stockholders plus adjustments resulting from the assumption that dilutive options were exercised or that other shares were issued upon the satisfaction of certain conditions. + References No definition available. + Details
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- Definition Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs). + 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 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Amount after tax of income (loss) from continuing operations attributable to the parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4613673-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 4: 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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