Equity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reconciliation of equity attributable to non-controlling interests
NCI, beginning of period	$ (11.6)	$ (0.1)	$ (11.5)	$ 2.1
Net income (loss) attributable to NCI, net of tax	0.0	(2.7)	(0.1)	(5.8)
Fair value of net assets and liabilities acquired and assigned to NCI	0.0	0.0	0.0	0.9
Translation adjustment and other	0.0	0.1	0.0	0.1
NCI, end of period	$ (11.6)	$ (2.7)	$ (11.6)	$ (2.7)