Intangible Assets, net (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) item
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	$ 717.2	$ 760.2
Intangible assets subject to amortization, Accumulated Amortization	(402.8)	(405.7)
Intangible assets
Intangible assets, Gross Carrying Amount	1,474.8	1,517.8
Amortization expense for intangible assets	45.8	50.6	$ 54.1
Changes in intangible assets due to foreign currency translation losses	(4.1)
Impairment losses of intangible assets, indefinite-lived	16.5		$ 36.4
Impairment losses of intangible assets, finite-lived	16.7
Summary of estimated aggregate amortization expense for each of the succeeding five years
2019	43.0
2020	43.0
2021	41.3
2022	36.7
2023	30.7
2018 Acquisitions
Intangible assets
Intangible assets recorded in connection with our 2018 acquisitions	43.3
Trade names
Intangible assets not subject to amortization:
Intangible assets not subject to amortization, Gross Carrying Amount	$ 757.6	757.6
Intangible assets
Number of intangible assets subject to impairment | item	1		8
Impairment losses of intangible assets, indefinite-lived	$ 16.5		$ 36.4
Trade names | 2018 Acquisitions
Intangible assets not subject to amortization:
Intangible assets not subject to amortization, Gross Carrying Amount	$ 18.3
Covenants not to compete
Intangible assets subject to amortization:
Weighted average amortizable life in years	4 years 9 months 18 days
Intangible assets subject to amortization, Gross Carrying Amount	$ 0.8	0.8
Intangible assets subject to amortization, Accumulated Amortization	$ (0.4)	(0.4)
Customer lists/relationships
Intangible assets subject to amortization:
Weighted average amortizable life in years	14 years 10 months 24 days
Intangible assets subject to amortization, Gross Carrying Amount	$ 707.3	745.0
Intangible assets subject to amortization, Accumulated Amortization	$ (393.4)	(391.3)
Intangible assets
Number of intangible assets subject to impairment | item	1
Impairment losses of intangible assets, finite-lived	$ 16.7
Software
Intangible assets subject to amortization:
Weighted average amortizable life in years	10 years
Intangible assets subject to amortization, Gross Carrying Amount	$ 8.1	8.1
Intangible assets subject to amortization, Accumulated Amortization	$ (8.1)	(8.1)
Other
Intangible assets subject to amortization:
Weighted average amortizable life in years	7 years 4 months 24 days
Intangible assets subject to amortization, Gross Carrying Amount	$ 1.0	6.3
Intangible assets subject to amortization, Accumulated Amortization	$ (0.9)	$ (5.9)