Goodwill - Changes in Carrying Value of Goodwill by Reportable Segment (Details) - USD ($)	3 Months Ended			12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Balance at beginning of period				$ 1,225,800,000	$ 1,260,100,000
Goodwill Impairment charge	$ 0	$ 0	$ 0	0	(66,800,000)	$ (64,000,000.0)
Acquisitions				522,700,000	0
Currency impact and other				(26,300,000)	32,500,000
Balance at end of period				1,722,200,000	1,225,800,000	1,260,100,000
Reportable segments | Americas
Goodwill [Roll Forward]
Balance at beginning of period				536,600,000	535,600,000
Acquisitions				522,700,000
Currency impact and other				(400,000)	1,000,000.0
Balance at end of period				1,058,900,000	536,600,000	535,600,000
Reportable segments | Southern Europe
Goodwill [Roll Forward]
Balance at beginning of period				154,900,000	144,800,000
Acquisitions				0
Currency impact and other				(8,200,000)	10,100,000
Balance at end of period				146,700,000	154,900,000	144,800,000
Reportable segments | Northern Europe
Goodwill [Roll Forward]
Balance at beginning of period				326,600,000	374,600,000
Goodwill Impairment charge					(66,800,000)
Acquisitions				0
Currency impact and other				(12,900,000)	18,800,000
Balance at end of period				313,700,000	326,600,000	374,600,000
Reportable segments | APME
Goodwill [Roll Forward]
Balance at beginning of period				81,700,000	79,100,000
Acquisitions				0
Currency impact and other				(4,800,000)	2,600,000
Balance at end of period				76,900,000	81,700,000	79,100,000
Corporate
Goodwill [Roll Forward]
Balance at beginning of period				126,000,000.0	126,000,000.0
Acquisitions				0
Currency impact and other				0
Balance at end of period				$ 126,000,000.0	$ 126,000,000.0	$ 126,000,000.0