Subsequent Events - Narrative (Details) - Subsequent Event	Apr. 14, 2017 EUR (€)
Subsequent Event [Line Items]
Valuation of German Group Companies	€ 90,000,000
AGER Offering, Percent of Voting Power on Closing	10.00%
AGER Offering \| Maximum
Subsequent Event [Line Items]
Investment commitment	€ 285,000,000
AGER Offering \| Minimum
Subsequent Event [Line Items]
Investment commitment	€ 260,000,000

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant