Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income tax (expense) benefit	$ (59.2)	$ (54.7)	$ (162.5)	$ (150.2)
Effective income tax rate reconciliation, percent	22.70%	22.90%	22.80%	23.70%