Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Cash Flows (Parenthetical)

v3.8.0.1
Consolidated Statements of Cash Flows (Parenthetical)
Dec. 31, 2017
Sep. 30, 2017
May 19, 2017
Oct. 03, 2016
6.125% senior unsecured notes due 2024        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated (as a percent) 6.125% 6.125% 6.125% 6.125%