Goodwill and Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, accumulated amortization	$ (833.7)	$ (650.3)
Gross Value	1,896.3	1,778.5
Accumulated Amortization	(833.7)	(650.3)
Net Value	1,062.6	1,128.2
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	1,333.1	1,199.7
Finite-lived intangible assets, accumulated amortization	(827.5)	(637.1)
Finite-lived intangible assets, net value	505.6	562.6
Accumulated Amortization	(827.5)	(637.1)
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	17.2	32.8
Finite-lived intangible assets, accumulated amortization	(6.2)	(13.2)
Finite-lived intangible assets, net value	11.0	19.6
Accumulated Amortization	$ (6.2)	$ (13.2)
Minimum | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	1 year	1 year
Minimum | Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	2 years	2 years
Maximum | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	15 years	15 years
Maximum | Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	13 years	13 years
C&W trade name
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 546.0	$ 546.0