Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) - Measured on a recurring basis - USD ($) $ in Millions	Jun. 30, 2016	Jun. 30, 2015
Assets and liabilities measured at fair value on a recurring basis
Derivative financial instruments, Assets	$ 11.8	$ 4.4
Total assets	15.9	9.4
Derivative financial instruments, Liabilities	43.9	53.5
Level 2
Assets and liabilities measured at fair value on a recurring basis
Derivative financial instruments, Assets	11.8	4.4
Total assets	15.9	9.4
Derivative financial instruments, Liabilities	43.9	53.5
Municipal auction rate securities
Assets and liabilities measured at fair value on a recurring basis
Municipal auction rate securities	4.1	5.0
Municipal auction rate securities | Level 2
Assets and liabilities measured at fair value on a recurring basis
Municipal auction rate securities	$ 4.1	$ 5.0