Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	[1]
Statement of Comprehensive Income [Abstract]
Net Income	$ 60.2	$ 32.8
Defined benefit plans
Plan sponsored by equity affiliates, net of tax	0.7
Other Comprehensive Income	0.7
Comprehensive Income	60.9	32.8
Less: Comprehensive Income attributable to noncontrolling interests	3.0
Comprehensive Income Attributable to the Partnership	$ 57.9	$ 32.8

[1] Prior-period financial information has been retrospectively adjusted for acquisitions of businesses under common control.