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Debt and Credit Facilities 5.625% Senior Notes due December 2026 (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Dec. 22, 2016
Debt Instrument [Line Items]      
Document Period End Date   Jun. 30, 2017  
5.625% Senior Notes due 2026 [Member]      
Debt Instrument [Line Items]      
Debt instrument, stated interest rate 5.625% 5.625% 5.625%
Proceeds from Issuance of Senior Long-term Debt $ 495.0    
Change of Control [Member] | 5.625% Senior Notes due 2026 [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount of Senior Notes, Redemption Price, Percentage   101.00%  
Before December 15, 2021 [Member] | 5.625% Senior Notes due 2026 [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount of Senior Notes, Redemption Price, Percentage   100.00%  
Aggregate Principal Amount of Senior Notes, Redemption of Principal Amount, Percentage   35.00%  
Before December 15, 2021 [Member] | 5.625% Senior Notes due 2026 [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount of Senior Notes, Redemption of Principal Amount, Percentage   50.00%  
Asset Sale [Member] | 5.625% Senior Notes due 2026 [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount of Senior Notes, Redemption Price, Percentage   100.00%  
At any time and from time to time before December 15, 2021 [Member] | 5.625% Senior Notes due 2026 [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount of Senior Notes, Redemption Price, Percentage   105.625%