Equity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reconciliation of equity attributable to non-controlling interests
NCI, beginning of period	$ (11.6)	$ 1.3	$ (11.5)	$ 2.1
Net income (loss) attributable to NCI, net of tax	0.0	(1.4)	(0.1)	(3.1)
Fair value of net assets and liabilities acquired and assigned to NCI	0.0	0.0	0.0	0.9
NCI, end of period	$ (11.6)	$ (0.1)	$ (11.6)	$ (0.1)