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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) $ in Millions	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($) $ / $	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) $ / $	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) reporting_unit $ / $	Dec. 31, 2018 USD ($) $ / $	Dec. 31, 2017 USD ($) $ / $	Dec. 31, 2016 $ / $
Investment [Line Items]
Number of reporting units \| reporting_unit											8
Goodwill	$ 784.6				$ 678.6						$ 784.6	$ 678.6	$ 453.7
Net monetary assets	1,232.6				1,206.5						1,232.6	1,206.5
Cash and cash equivalents	311.0				343.4						311.0	343.4
Argentina conversion losses											(22.9)	(13.9)	(9.2)
Loss on deconsolidation of Venezuela operations											0.0	(126.7)	0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Deconsolidation, pretax											(61.2)	(172.0)	(54.3)
Revenues	$ 935.8	$ 928.4	$ 914.0	$ 905.0	$ 907.7	$ 852.4	$ 849.7	$ 879.1			3,683.2	3,488.9	3,347.0
Provision for Doubtful Accounts											$ 22.8	1.4	5.0
Minimum
Investment [Line Items]
Remaining useful lives (in years)											1 year
Percentage of Fair Value in Excess of Carrying Amount	36.00%										36.00%
Maximum
Investment [Line Items]
Remaining useful lives (in years)											14 years
Percentage of Fair Value in Excess of Carrying Amount	234.00%										234.00%
Venezuela
Investment [Line Items]
Revenues											$ 0.0	51.4	$ 154.1
Venezuela \| Venezuelan bolívar fuerte
Investment [Line Items]
Rate decrease percent							97.00%		97.00%				80.00%
Currency remeasurement gain (loss)									$ 2.2				$ (9.1)
Loss on deconsolidation of Venezuela operations							$ 126.7
Derecognition of the carrying amounts of assets included in the deconsolidation charge							32.0
Derecognition of the carrying amounts of liabilities included in the deconsolidation charge							11.0
Income (loss) attributable to noncontrolling interest									$ 2.0				1.0
ARGENTINA
Investment [Line Items]
Revenues											214.4	$ 247.2	$ 250.3
ARGENTINA \| Argentina, Pesos
Investment [Line Items]
Goodwill	$ 99.8										$ 99.8
Percent of Consolidated Revenue											6.00%	7.00%	7.00%
Rate decrease percent	37.00%				50.00%						37.00%	50.00%	15.00%
Official exchange rate \| $ / $	59.9				37.6						59.9	37.6	18.6	15.9
Currency remeasurement gain (loss)						$ (8.1)					$ (11.3)	$ (6.2)
Net monetary assets	$ 16.3										16.3
Cash and cash equivalents	16.2										16.2
Net nonmonetary assets	$ 150.5										150.5
Devaluation settled rates	25.00%
Argentina conversion losses											4.7
Foreign Currency Translation Adjustments
Investment [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Deconsolidation, pretax											0.0	$ (107.2)	$ 0.0
Foreign Currency Translation Adjustments \| Venezuela \| Venezuelan bolívar fuerte
Investment [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Deconsolidation, pretax							$ 106.0
France
Investment [Line Items]
Percentage of Fair Value in Excess of Carrying Amount		20.00%			9.00%					20.00%		9.00%
Goodwill	$ 89.2	$ 90.4								$ 90.4	$ 89.2
Canada
Investment [Line Items]
Percentage of Fair Value in Excess of Carrying Amount	36.00%										36.00%
Goodwill	$ 3.4										$ 3.4
Internal Loss AR Rebuild
Investment [Line Items]
Third-party expense										$ 4.5
Revenues		4.0
Bank fees		0.3
Increase to bad debt expense	6.4	13.7									20.1
Provision for Doubtful Accounts											19.2
Immaterial error correction		$ 10.0
Accounts receivable	$ 34.0										$ 34.0
Percent of Accounts Receivable	56.00%										56.00%