Revenue (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) end_market	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, description of timing	We do not receive a distinct service or good in return for these BIPs, but rather receive volume commitments and/or sole supplier status from our customers over the life of the contractual arrangements, which approximates a five-year weighted average useful life.
Business incentive plan assets, carrying value	$ 165.4	$ 191.2
Amortization amount	64.1	66.9	$ 65.5
Upfront incentive payment	79.8	79.0
Contract asset	$ 37.2	$ 37.5
Number of end markets | end_market	4