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Debt 2017 Senior Notes (Details)
€ in Thousands, £ in Thousands
Mar. 31, 2019
GBP (£)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
EUR (€)
Jun. 30, 2018
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 884,967,000     $ 988,190,000
Debt Instrument, Interest Rate, Stated Percentage       4.00%  
Long-term Debt   1,183,227,000     1,316,001,000
STE 6.83% due 2018 Senior Notes [Member] [Domain] [Domain] [Domain] [Domain]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 0     85,000,000
Debt Instrument, Interest Rate, Stated Percentage 6.33% 6.33% 6.33%    
STE 6.93% due 2020 Senior Notes [Member] [Domain]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 35,000,000     35,000,000
Debt Instrument, Interest Rate, Stated Percentage 6.43% 6.43% 6.43%    
STE 3.70% due 2030 Senior Notes [Member] [Domain]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 100,000,000      
Debt Instrument, Interest Rate, Stated Percentage 3.70% 3.70% 3.70%    
STE 3.70% due 2022 Senior Notes [Member] [Domain]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 91,000,000     91,000,000
Debt Instrument, Interest Rate, Stated Percentage 3.20% 3.20% 3.20%    
STE 3.85% due 2024 Senior Notes [Member] [Domain]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 80,000,000     80,000,000
Debt Instrument, Interest Rate, Stated Percentage 3.35% 3.35% 3.35%    
STE 4.05% due 2027 Senior Notes [Member] [Domain]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 25,000,000     25,000,000
Debt Instrument, Interest Rate, Stated Percentage 3.55% 3.55% 3.55%    
STE 3.45% due 2025 Senior Notes [Member] [Domain] [Domain]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 125,000,000     125,000,000
Debt Instrument, Interest Rate, Stated Percentage 3.45% 3.45% 3.45%    
STE 3.55% due 2027 Senior Notes [Member] [Domain]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 125,000,000     125,000,000
Debt Instrument, Interest Rate, Stated Percentage 3.55% 3.55% 3.55%    
STE 3.70% due 2030 Senior Notes [Member] [Domain] [Domain] [Domain]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 100,000,000     100,000,000
STE 3.93% due 2027 Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 50,000,000     50,000,000
Debt Instrument, Interest Rate, Stated Percentage 3.93% 3.93% 3.93%    
STE 1.86% due 2027 Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 67,352,000 € 60,000   73,912,000
Debt Instrument, Interest Rate, Stated Percentage 1.86% 1.86% 1.86%    
STE 4.03% due 2029 Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 45,000,000     45,000,000
Debt Instrument, Interest Rate, Stated Percentage 4.03% 4.03% 4.03%    
STE 2.04% due 2029 Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 22,450,000 € 20,000   24,637,000
Debt Instrument, Interest Rate, Stated Percentage 2.04% 2.04% 2.04%    
STE 3.04% due 2029 Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount £ 45,000 $ 58,702,000     63,141,000
Debt Instrument, Interest Rate, Stated Percentage 3.04% 3.04% 3.04%    
STE 2.30% due 2032 Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 21,328,000 € 19,000   23,406,000
Debt Instrument, Interest Rate, Stated Percentage 2.30% 2.30% 2.30%    
STE 3.17% due 2032 Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount £ 30,000 $ 39,135,000     42,094,000
Debt Instrument, Interest Rate, Stated Percentage 3.17% 3.17% 3.17%    
Senior Notes [Member]          
Debt Instrument [Line Items]          
Long-term Debt   $ 884,967,000     $ 988,190,000