Derivative Instruments and Hedging Activities - Risk Management (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivative instruments and hedging activities
Fair value, net asset (liability)	$ (26.6)	$ (6.5)
Embedded derivative in purchase and delivery contracts
Embedded derivatives in purchase and delivery contracts
Notional amount of derivative sale contracts	12.2	12.3
Notional amount of derivative purchase contracts	6.5	6.1
Forward currency and swap agreements
Derivative instruments and hedging activities
Notional Amount	590.6	579.4
Fair value, net asset (liability)	(29.1)	(6.3)
Forward currency contract
Derivative instruments and hedging activities
Notional amount, assets	50.2	66.7
Notional amount, liabilities	35.4	7.7
Not designated as accounting hedges
Assets	0.3	0.9
Liabilities	0.2	0.4
Fixed price commodity contracts
Derivative instruments and hedging activities
Notional Amount	10.2	5.6
Interest rate cross-currency swap agreements
Derivative instruments and hedging activities
Notional amount, liabilities	505.0	505.0
Designated as accounting hedges
Liabilities	$ (29.2)	$ (6.8)