Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory tax benefit	$ (108.3)	$ (67.2)	$ (87.0)
Brazil non-taxable incentive	(3.8)	(3.9)	(5.8)
Valuation allowances	80.6	10.5	14.9
Goodwill impairment	41.8	0.0	0.0
Foreign tax rate differential	(33.7)	(31.5)	(10.0)
Foreign subsidiary earnings	4.9	14.4	13.7
Accrual adjustments	3.1	4.1	1.1
Tax Act - rate impact on deferred tax balance	(2.5)	45.1	0.0
Tax Act - deemed repatriation tax	32.6	36.6	0.0
Business tax credits	(1.1)	(0.6)	(0.7)
Non-deductible (non-taxable) items	18.9	22.1	4.5
Other	4.7	(1.3)	0.3
Income tax expense (benefit)	$ 37.2	$ 28.3	$ (69.0)