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Long-Term Debt and Capital Leases - Long-Term Debt (Details)
Oct. 01, 2017
GBP (£)
Oct. 01, 2017
USD ($)
Apr. 18, 2017
EUR (€)
Mar. 31, 2017
EUR (€)
Mar. 31, 2017
USD ($)
Jan. 01, 2017
USD ($)
Debt Instrument [Line Items]            
Total debt   $ 1,190,900,000       $ 611,700,000
Less: current portion of long-term debt and debt issuance costs   (3,400,000)       (102,000,000)
Total long-term debt   1,187,500,000       509,700,000
Debt issue costs   2,200,000       1,400,000
Other debt at various rates due through 2018            
Debt Instrument [Line Items]            
Total debt   3,000,000       4,200,000
Credit facility | $750.0 million credit facility due December 2020, weighted average rate of 2.41% at October 1, 2017            
Debt Instrument [Line Items]            
Total debt   285,000,000       0
Line of credit facility, current borrowing capacity   $ 750,000,000        
Weighted average interest rate 2.41% 2.41%        
Term Loans | Term loans due through January 2022            
Debt Instrument [Line Items]            
Total debt   $ 182,500,000       $ 182,500,000
Weighted average interest rate 2.61% 2.61%       1.90%
Term Loans | Term loan due October 2019            
Debt Instrument [Line Items]            
Total debt   $ 100,000,000       $ 0
Debt instrument, face amount       € 93,000,000.0 $ 100,000,000.0  
Stated interest rate 0.7055% 0.7055%        
Effective interest rate 2.49% 2.49%        
Senior Notes            
Debt Instrument [Line Items]            
Debt instrument, face amount | €     € 250,000,000.0      
Senior Notes | 4.74% Fixed Rate Senior Notes due and repaid September 2017            
Debt Instrument [Line Items]            
Total debt   $ 0       100,000,000
Stated interest rate 4.74% 4.74%        
Senior Notes | 2.61% Fixed Rate Senior Notes due December 2019            
Debt Instrument [Line Items]            
Total debt   $ 30,000,000       30,000,000
Stated interest rate 2.61% 2.61%        
Senior Notes | 5.30% Fixed Rate Senior Notes due September 2020            
Debt Instrument [Line Items]            
Total debt   $ 75,000,000       75,000,000
Stated interest rate 5.30% 5.30%        
Senior Notes | 2.81% Fixed Rate Senior Notes due November 2020            
Debt Instrument [Line Items]            
Total debt   $ 25,000,000       25,000,000
Stated interest rate 2.81% 2.81%        
Senior Notes | 3.09% Fixed Rate Senior Notes due December 2021            
Debt Instrument [Line Items]            
Total debt   $ 95,000,000       95,000,000
Stated interest rate 3.09% 3.09%        
Senior Notes | 3.28% Fixed Rate Senior Notes due November 2022            
Debt Instrument [Line Items]            
Total debt   $ 100,000,000       100,000,000
Stated interest rate 3.28% 3.28%        
Senior Notes | 0.70% €50 Million Fixed Rate Senior Notes due April 2022            
Debt Instrument [Line Items]            
Total debt   $ 59,000,000       0
Debt instrument, face amount | £ £ 50,000,000          
Stated interest rate 0.70% 0.70%        
Senior Notes | 0.92% €100 Million Fixed Rate Senior Notes due April 2023            
Debt Instrument [Line Items]            
Total debt   $ 118,200,000       0
Debt instrument, face amount | £ £ 100,000,000          
Stated interest rate 0.92% 0.92%        
Senior Notes | 1.09% €100 Million Fixed Rate Senior Notes due April 2024            
Debt Instrument [Line Items]            
Total debt   $ 118,200,000       $ 0
Debt instrument, face amount | £ £ 100,000,000          
Stated interest rate 1.09% 1.09%