Earnings per Unit (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Basic and Diluted Earnings Per Unit

The following table summarizes the basic and diluted earnings per unit calculations (in millions, except per unit amounts):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Allocation of net income among partner interests:
Net income allocated to Class A common unitholders	$	167.6	$	89.5	$	315.4	$	139.7
Net income allocated to Partnership exchangeable unitholders	146.4		86.1		277.2		134.6
Net income attributable to common unitholders	$	314.0	$	175.6	$	592.6	$	274.3
Denominator - basic and diluted partnership units:
Weighted average Class A common units	202.0		202.0		202.0		202.0
Weighted average Partnership exchangeable units	217.6		226.9		217.7		226.9
Earnings per unit - basic and diluted:
Class A common units	$	0.83	$	0.44	$	1.56	$	0.69
Partnership exchangeable units	$	0.67	$	0.38	$	1.27	$	0.59