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Borrowings (Details)
$ in Millions
6 Months Ended
Apr. 27, 2016
Jun. 30, 2017
USD ($)
Jun. 30, 2016
Dec. 31, 2016
USD ($)
Mar. 31, 2016
Debt Instrument [Line Items]          
Document Fiscal Year Focus   2017      
Long-term borrowings [Abstract]          
Long-term debt   $ 298.1   $ 298.2  
Less: current maturities   13.3   9.7  
Long-term portion   284.8   288.5  
Term Loan and Revolving Credit Facility Due January 2019 [Member]          
Long-term borrowings [Abstract]          
Long-term debt   159.6   163.1  
Less: current maturities   14.2   10.6  
Long-term portion   145.4   152.5  
Fourth Amendment April 2016          
Long-term borrowings [Abstract]          
Debt Instrument, Covenant, EBITDA to Interest Ratio, Minimum 3.25        
Debt Instrument, Covenant, Debt to EBITDA, Maximum 3.75        
Debt Instrument, Covenant, Senior Secured Leverage Ratio, Maximum 3.25        
Convertible Debt | Convertible Notes Due Twenty Twenty One [Member]          
Long-term borrowings [Abstract]          
Convertible notes payable   $ 138.5   135.1  
Senior Notes          
Long-term borrowings [Abstract]          
Debt Instrument, Term   5 years      
Senior Notes | Term Loan due January 2019          
Long-term borrowings [Abstract]          
Long-term debt   $ 114.9   118.5  
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year   7.2      
Long-term Debt, Maturities, Repayments of Principal in Year Two   14.4      
Long-term Debt, Maturities, Repayments of Principal in Year Three   138.3      
Long-term Debt, Maturities, Repayments of Principal in Year Four   0.0      
Long-term Debt, Maturities, Repayments of Principal in Year Five   172.5      
Line of Credit | Revolving Credit Facility          
Long-term borrowings [Abstract]          
Secured revolving credit facility, maximum borrowing capacity   $ 300.0      
Debt Instrument, Term   5 years      
Line of Credit | Revolving Credit Facility | Revolving Credit Facility due January 2019          
Long-term borrowings [Abstract]          
Long-term debt   $ 45.0   $ 45.0  
Credit Facilities | Minimum          
Long-term borrowings [Abstract]          
Line of Credit Facility, Commitment Fee Percentage   0.20%      
Credit Facilities | Maximum          
Long-term borrowings [Abstract]          
Line of Credit Facility, Commitment Fee Percentage   0.40%      
Credit Facilities | Weighted Average          
Long-term borrowings [Abstract]          
Line of Credit Facility, Commitment Fee Percentage   0.39% 0.40%    
Credit Facilities | LIBOR          
Long-term borrowings [Abstract]          
Debt Instrument, Interest Rate, Effective Percentage   3.67%     2.69%
Credit Facilities | LIBOR | Minimum          
Long-term borrowings [Abstract]          
Debt Instrument, Basis Spread on Variable Rate   1.25%      
Credit Facilities | LIBOR | Maximum          
Long-term borrowings [Abstract]          
Debt Instrument, Basis Spread on Variable Rate   2.25%