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Consolidated Statements of Cash Flows (Parenthetical)
$ in Millions
 9 Months Ended
Jun. 22, 2016
USD ($)
promissory_note
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Supplemental Schedule of Noncash Investing and Financing Activities      
Cash dividends declared, but not yet paid   $ 4.2 $ 4.2
Previous percentage ownership of noncontrolling owners 49.00% 49.00% [1],[2]  
Settlement of promissory notes $ 17.7    
Assets acquired, net of cash [1]   $ 321.6 100.1
Liabilities assumed [1]   $ 59.2 $ 22.3
Tobras | Disposal Group, Held-for-sale, Not Discontinued Operations      
Supplemental Schedule of Noncash Investing and Financing Activities      
Number of promissory notes settled in acquisition item | promissory_note 2    
[1] Amounts may not add due to rounding
[2] Relates to Tobras. See Note 3. Acquisitions, Asset and Liabilities Held for Sale.