Financial Instruments - Schedule of Fair Value Measurements (Details) - Recurring - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Asset Category
Total	$ 16.9	$ 19.9
Liability Category
Total	96.7	27.8
Other current assets | Level 2 | Metals contracts not designated as hedging instruments | Not Designated as Hedging Instrument
Asset Category
Derivatives	0.4	0.3
Other current assets | Level 2 | Foreign exchange contracts not designated as hedging instruments | Not Designated as Hedging Instrument
Asset Category
Derivatives	0.2	0.9
Other current assets | Level 2 | Cross currency swaps designated as net investment hedge | Designated as Hedging Instrument
Asset Category
Derivatives	16.3	18.4
Other assets | Level 1
Asset Category
Available for sale equity securities	0.0	0.3
Accrued expenses and other current liabilities | Level 2 | Metals contracts not designated as hedging instruments | Not Designated as Hedging Instrument
Liability Category
Derivatives	1.6	0.7
Accrued expenses and other current liabilities | Level 2 | Foreign exchange contracts not designated as hedging instruments | Not Designated as Hedging Instrument
Liability Category
Derivatives	0.7	0.2
Accrued expenses and other current liabilities | Level 2 | Interest rate swaps designated as cash flow hedging instruments | Designated as Hedging Instrument
Liability Category
Derivatives	17.6	6.9
Other liabilities | Level 2 | Interest rate swaps designated as cash flow hedging instruments | Designated as Hedging Instrument
Liability Category
Derivatives	33.5	19.7
Other liabilities | Level 2 | Cross currency swaps designated as net investment hedge | Designated as Hedging Instrument
Liability Category
Derivatives	$ 43.3	$ 0.3