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Earnings Per Share ("EPS") (Details) - USD ($) 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, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Net income (loss) available to common stockholders, diluted |  | $ 50.3 | $ (5.2) | $ 56.4 | $ 3.9
Less: Distributions to holders of Class A equity interests of a subsidiary |  |  |  | 103.9 | 102.0
Net income (loss) available to common stockholders, basic |  | $ 49.7 | $ (5.9) | $ 55.3 | $ 2.5
Weighted average shares for basic EPS |  | 142.3 | 139.2 | 141.5 | 139.0
Dilutive potential shares from grants of RSUs, PRSUs and stock options | [1] | 0.6 | 0.0 | 0.5 | 0.3
Weighted average shares for diluted EPS |  | 142.9 | 139.2 | 142.0 | 139.3
Noncontrolling Interest |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Less: Distributions to holders of Class A equity interests of a subsidiary |  | $ 0.5 | $ 0.7 | $ 1.1 | $ 1.4
Less: Undistributed earnings allocable to Class A equity interests |  | $ 0.1 | $ 0.0 | $ 0.0 | $ 0.0
Noncontrolling Interest |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share, number of shares |  | 1.5 | 2.0 | 1.6 | 2.0
Stock compensation plan |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share, number of shares |  | 0.1 | 1.3 | 0.1 | 1.0
[1] | The potential impact of an aggregate 0.1 million granted RSUs, PRSUs and stock options in the three months ended June 30, 2019, 1.3 million in the three months ended June 30, 2018, 0.1 million in the six months ended June 30, 2019, and 1.0 million in the six months ended June 30, 2018, were antidilutive.

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + 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 (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1377-109256 + Details
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