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Share Repurchase (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 21, 2016
May 02, 2018
Mar. 31, 2018
Mar. 31, 2018
Subsequent Event [Line Items]        
Total repurchase authorization 500.0      
Stock repurchase program, period in force 5 years      
Stock repurchased during period (in shares)     2.8 2.8
Repurchase of equity     $ 106.5 $ 106.5
Remaining authorized repurchase amount     $ 193.6 $ 193.6
Subsequent Event        
Subsequent Event [Line Items]        
Repurchase of equity   $ 15.8