Annual report pursuant to Section 13 and 15(d)

Derivative Financial Instruments - Summary of Gain (Loss) on Derivative Instruments (Details)

v3.8.0.1
Derivative Financial Instruments - Summary of Gain (Loss) on Derivative Instruments (Details) - Foreign exchange contracts - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flow hedges | Cash flow hedging      
Derivative Instruments, Gain (Loss) [Line Items]      
(Losses) gains recognized in other comprehensive income (OCI) $ (2.6) $ (0.5) $ 4.4
(Losses) gains reclassified from AOCI (0.6) 1.5 3.8
Non-designated hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
(Losses) gains recognized in income $ (2.0) $ 0.8 $ 0.0