Income taxes (Tables)

6 Months Ended

Jun. 30, 2017

Income tax benefit

Schedule of components of income tax benefit

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Current income tax expense	$	1.4	$	0.3	$	2.3	$	1.8
Deferred income benefit		(23.7)		(18.7)		(24.9)		(18.6)
Total income tax benefit, net	$	(22.3)	$	(18.4)	$	(22.6)	$	(16.8)