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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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