Share-based Compensation (Options) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Options [Roll Forward]
Exercised, shares	(500,000)	(900,000)	(500,000)
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period	10 years
Award vesting period			3 years
Options [Roll Forward]
Outstanding, shares, at beginning of year	1,836,700
Granted, shares	1,237,800
Exercised, shares	(485,500)
Forfeited, shares	(167,800)
Outstanding, shares, at end of year	2,421,200	1,836,700
Weighted Average Exercise Price [Abstract]
Outstanding, weighted average exercise price per share, at beginning of year	$ 44.34
Granted, weighted average exercise price	55.89
Exercised, weighted average exercise price	39.36
Forfeited, weighted average exercise price	54.18
Outstanding, weighted average exercise price per share, at end of year	$ 50.56	$ 44.34
Outstanding, weighted average remaining contractual term, at end of year (in years)	7 years 8 months 23 days
Outstanding, aggregate intrinsic value, at end of year	$ 7.6
Exercisable, shares, at end of year	714,100
Exercisable, weighted average exercise price, at end of year	$ 43.63
Exercisable, weighted average remaining contractual term, at end of year (in years)	5 years 8 months 23 days
Exercisable, aggregate intrinsic value, at end of year	$ 5.7
Fair value assumptions [Abstract]
Risk free interest rate, minimum	1.80%	1.30%	1.80%
Risk free interest rate, maximum	2.60%	2.10%	2.00%
Expected dividend yield	4.00%	4.00%	4.00%
Expected option life		7 years	7 years
Expected stock price volatility		29.00%	36.00%
Expected stock price volatility, maximum	28.00%
Expected stock price volatility, minimum	36.00%
Granted, weighted average grant date fair value	$ 13.58	$ 9.35	$ 10.80
Exercised, total intrinsic value	$ 10.9	$ 15.2	$ 8.0
Unearned compensation cost	$ 7.7
Unearned compensation cost, weighted average period of recognition (in years)	2 years
Cash received from option exercises	$ 19.1	37.9	18.2
Tax benefit realized from option exercises	$ 2.7	$ 5.9	$ 3.0
Minimum | Employee Stock Option
Fair value assumptions [Abstract]
Expected option life	4 years 10 months 24 days
Maximum | Employee Stock Option
Fair value assumptions [Abstract]
Expected option life	7 years