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Convertible Securities (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Schedule of Carrying Value of Convertible Securities

The carrying value and principal amount at maturity of the junior convertible securities were as follows:

		December 31, 2017								December 31, 2018
		Carrying Value				Principal Amount at Maturity				Carrying Value				Principal Amount at Maturity
Junior convertible securities(1)		$	309.9			$	430.8			$	312.5			$	430.8

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⁽¹⁾  The carrying value is accreted to the principal amount at maturity over a remaining life of 19 years.

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Tabular disclosure of the carrying amount and fair value of convertible securities.

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