Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Contingency [Line Items]
Income tax (expense) benefit	$ (64.6)	$ (56.8)	$ (103.3)	$ (95.5)
Effective income tax rate reconciliation, percent	24.70%	24.70%	22.80%	24.10%