Stockholders' Equity - Reconciliation of Denominators used in Computation of Basic and Diluted Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stockholders' Equity Note [Abstract]
Basic weighted average shares outstanding (in shares)	573,159,138	574,280,852	572,669,693	574,783,228
Weighted shares assumed upon exercise of stock options (in shares)	1,392,211	234,122	1,105,366	335,708
Diluted weighted average shares outstanding (in shares)	574,551,349	574,514,974	573,775,059	575,118,936