Restructuring Charges - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	18 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2019
Restructuring and Related Activities [Abstract]
Expected savings			$ 650,000
Restructuring charges	$ 8,731	$ 24,900		$ 163,700
Expected restructuring costs	$ 200,000			$ 200,000

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Period Type:	duration