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Fair Value Measurements (Details 1) - USD ($)
$ in Millions
Jun. 30, 2018
Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Line of Credit, Carrying Value $ 0.0 $ 10.1
2.125% Senior Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior Notes, Carrying Value 299.0 298.1
2.625% Senior Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior Notes, Carrying Value 288.0 288.0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Line of Credit Facility, Fair Value 0.0 10.1
Fair Value, Inputs, Level 2 [Member] | 2.125% Senior Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior Notes, Fair Value 299.5 299.4
Fair Value, Inputs, Level 2 [Member] | 2.625% Senior Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior Notes, Fair Value $ 297.3 $ 298.7