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Goodwill and Intangible Assets - Summary of Goodwill by Operating Segment (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill	$ 2,110.0	$ 1,383.3	$ 1,364.4
Accumulated Impairment Losses	(450.8)	(450.8)	(447.5)
Carrying Value	1,659.2	932.5	916.9
ASG
Goodwill [Line Items]
Goodwill	1,563.4	836.7	836.7
Accumulated Impairment Losses	(418.9)	(418.9)	(418.9)
Carrying Value	1,144.5	417.8	417.8
ISG
Goodwill [Line Items]
Goodwill	114.4	114.4	95.5
Accumulated Impairment Losses	0.0	0.0	0.0
Carrying Value	114.4	114.4	95.5
PSG
Goodwill [Line Items]
Goodwill	432.2	432.2	432.2
Accumulated Impairment Losses	(31.9)	(31.9)	(28.6)
Carrying Value	$ 400.3	$ 400.3	$ 403.6

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