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Convertible Senior Notes - Narrative (Details) - USD ($)
$ in Millions
Jun. 01, 2018
Jun. 30, 2018
May 31, 2018
Dec. 30, 2017
Jul. 01, 2017
Long-term debt | Accounting Standards Update 2015-03          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Debt issuance cost increase (decrease)       $ 2.1  
1.75% Convertible Senior Notes Due June 1, 2018          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Repayment of debt $ 150.0        
Repayment of final coupon interest $ 1.3        
Net equity component carrying amount       $ 43.3  
Debt instrument interest percentage   1.75% 1.75%   1.75%
Additional effective rate of interest to be used on amortized carrying value   10.23%     10.23%