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Share-based Compensation (Equity Instruments Other than Options) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grant 8,000,000    
Restricted Stock      
Shares [Roll Forward]      
Nonvested at beginning of year 38,400    
Granted, shares/units 8,500    
Vested, shares/units (26,300)    
Nonvested at end of year 20,600 38,400  
Weighted Average Grant/Issue Date Fair Value [Roll Forward]      
Nonvested at beginning of year, weighted average grant/issue date fair value $ 41.85    
Granted, weighted average grant/issue date fair value 52.00    
Vested, weighted average grant/issue date fair value 39.57    
Nonvested at end of year, weighted average grant/issue date fair value $ 48.94 $ 41.85  
Nonvested at end of year, aggregate intrinsic value $ 1.0    
Unearned compensation cost $ 0.0    
Granted, weighted average grant date fair value $ 52.00 $ 47.65 $ 47.01
Total fair value of shares vested $ 1.5 $ 7.9 $ 8.5
Restricted Stock | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Restricted Stock | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 5 years    
Restricted Stock Units      
Shares [Roll Forward]      
Nonvested at beginning of year 431,100    
Granted, shares/units 555,600    
Vested, shares/units (370,700)    
Forfeited, shares/units (50,300)    
Nonvested at end of year 565,700 431,100  
Weighted Average Grant/Issue Date Fair Value [Roll Forward]      
Nonvested at beginning of year, weighted average grant/issue date fair value $ 47.80    
Granted, weighted average grant/issue date fair value 47.26    
Vested, weighted average grant/issue date fair value 43.47    
Forfeited, weighted average grant/issue date fair value 51.43    
Nonvested at end of year, weighted average grant/issue date fair value $ 49.78 $ 47.80  
Nonvested at end of year, aggregate intrinsic value $ 28.9    
Unearned compensation cost $ 9.7    
Unearned compensation cost, weighted average period of recognition (in years) 2 years    
Granted, weighted average grant date fair value $ 47.26 $ 52.97 $ 44.44
Total fair value of shares vested $ 20.4 $ 0.2 $ 0.1
Stock Equivalent Units      
Shares [Roll Forward]      
Nonvested at beginning of year 296,100    
Granted, shares/units 26,100    
Converted to common stock, units (3,100)    
Nonvested at end of year 319,100 296,100  
Weighted Average Grant/Issue Date Fair Value [Roll Forward]      
Nonvested at beginning of year, weighted average grant/issue date fair value $ 37.81    
Granted, weighted average grant/issue date fair value 50.97    
Converted to common stock, weighted average fair value 35.16    
Nonvested at end of year, weighted average grant/issue date fair value $ 38.92 $ 37.81  
Nonvested at end of year, aggregate intrinsic value $ 3.9    
Converted to common stock, total intrinsic value 0.1 $ 0.2 $ 0.1
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period     3 years
Weighted Average Grant/Issue Date Fair Value [Roll Forward]      
Unearned compensation cost $ 7.7    
Unearned compensation cost, weighted average period of recognition (in years) 2 years    
Granted, weighted average grant date fair value $ 13.58 $ 9.35 $ 10.80
Award expiration period 10 years