Accumulated Other Comprehensive Loss - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Unrecognized Net Defined Plan Costs
Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification adjustment from AOCI on unrecognized net defined plan costs, net gains	$ 1.2
Reclassification adjustment from AOCI on unrecognized net defined plan costs, tax	0.2
Change in Fair Value of Derivatives Products | Foreign Currency Forward Exchange Contracts
Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification adjustment from AOCI on derivatives, net gains	11.3
Reclassification adjustment from AOCI on derivatives, tax benefit	2.3
Change in Fair Value of Derivatives Products | Interest Rate Swap Agreements
Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification adjustment from AOCI on derivatives, net gains	0.8
Reclassification adjustment from AOCI on derivatives, tax benefit	$ 0.3