Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Amount of net losses associated with interest rate hedges to be reclassified with interest rate hedges during the next 12 months		$ (3.5)
Amount of net gains associated with currency rate risk to be reclassified into earnings during the next 12 months		15.2
Restricted cash	$ 55.5	$ 7.9	$ 15.6
Loss on ineffectiveness and excluded derivatives recognized in income	$ 3.4