Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions (Details)

v3.10.0.1
Related Party Transactions (Details) - NSP China - Subsidiaries - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]      
Notes receivable, related parties, current $ 6.0 $ 6.0 $ 2.0
Company's Joint Venture Partner      
Related Party Transaction [Line Items]      
Notes receivable, related parties, current 1.5 1.5 $ 0.5
Notes Receivable      
Related Party Transaction [Line Items]      
Related party transaction, amount 2.0 $ 4.0  
Related party transaction, rate   3.00%  
Notes Receivable | Company's Joint Venture Partner      
Related Party Transaction [Line Items]      
Related party transaction, amount $ 0.5 $ 1.0