Nature of Business and Summary of Significant Accounting Policies - Finite-lived Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amortizable Intangible Assets:
Gross Carrying Amount	$ 1,085.3	$ 1,071.0
Accumulated Amortization	(608.0)	(547.2)
Net Carrying Amount	477.3	523.8
Amortization expense	59.3	70.0	$ 61.8
Future amortization expense, 2020	62.0
Future amortization expense, 2021	59.0
Future amortization expense, 2022	57.0
Future amortization expense, 2023	55.0
Future amortization expense, 2024	53.0
Customer Relationships
Amortizable Intangible Assets:
Gross Carrying Amount	946.5	937.3
Accumulated Amortization	(497.6)	(442.7)
Net Carrying Amount	448.9	494.6
Patents, Trademarks, Licenses, and Leases
Amortizable Intangible Assets:
Gross Carrying Amount	138.8	133.7
Accumulated Amortization	(110.4)	(104.5)
Net Carrying Amount	$ 28.4	$ 29.2