Derivative Instruments - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Notional amount
Cross-currency swap agreements | Derivatives designated as hedges: | Level 2
Derivative [Line Items]
Notional amount	730.9	$ 730.9
Cross-currency swap agreements | Net Investment Hedging | Derivatives designated as hedges:
Derivative [Line Items]
Nonderivatives designated as hedges, notional amount	44.4
Interest rate swaps | Derivatives designated as hedges: | Level 2
Derivative [Line Items]
Notional amount	199.8	228.6
Interest rate swaps | Derivatives not designated as hedges: | Level 2
Derivative [Line Items]
Notional amount	$ 77.7	$ 43.5