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Debt and Credit Facility Convertible Debt (Details)
3 Months Ended
Jun. 30, 2017
$ / shares
2017 Senior Subordinated Convertible Debt  
Debt Instrument, Redemption [Line Items]  
Conversion Rate, adjusted 9.9890
Approximate Conversion Price, adjusted $ 100.11
Maximum Incremental Rate, adjusted 4.9945
Maximum Conversion Rate, adjusted 14.2344
2015 Senior Subordinated Convertible Debt  
Debt Instrument, Redemption [Line Items]  
Conversion Rate, adjusted 15.5772
Approximate Conversion Price, adjusted $ 64.20
Maximum Incremental Rate, adjusted 7.7886
Maximum Conversion Rate, adjusted 21.8081
2017 Junior Subordinated Convertible Debt  
Debt Instrument, Redemption [Line Items]  
Conversion Rate, adjusted 10.1674
Approximate Conversion Price, adjusted $ 98.35
Maximum Incremental Rate, adjusted 5.0838
Maximum Conversion Rate, adjusted 14.2344
2007 Junior Subordinated Convertible Debt  
Debt Instrument, Redemption [Line Items]  
Conversion Rate, adjusted 42.3241
Approximate Conversion Price, adjusted $ 23.63
Maximum Conversion Rate, adjusted 48.6727