Consolidated Statements of Cash Flows Consolidated Statements of Cash Flows - Footnotes $ in Millions	3 Months Ended
Jun. 30, 2018 USD ($)
Restatement Adjustment
Payment for make-whole premium	$ 6.2
Six Point Five Percent Notes Due March Two Thousand Nineteen
Payment for make-whole premium	$ 6.2

Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

Name:	us-gaap_PaymentsOfDebtExtinguishmentCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration