Goodwill and Intangible Assets - Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 1,425.4	$ 1,477.8
Accumulated Amortization	(676.0)	(689.9)
Net Book Value	749.4	787.9
Customer relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	972.4	984.3
Accumulated Amortization	(448.4)	(435.4)
Net Book Value	524.0	548.9
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	362.7	400.0
Accumulated Amortization	(215.4)	(241.5)
Net Book Value	147.3	158.5
Tradenames
Finite-Lived Intangible Assets
Gross Carrying Amount	90.3	91.8
Accumulated Amortization	(12.2)	(11.3)
Net Book Value	78.1	80.5
Other
Finite-Lived Intangible Assets
Gross Carrying Amount	0.0	1.7
Accumulated Amortization	0.0	(1.7)
Net Book Value	$ 0.0	$ 0.0