Equity - Reclassification Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Costs of sales and services	$ 688.5	$ 647.4
Selling, general and administrative expenses	189.4	183.9
Interest expense, net	(40.8)	(34.5)
Total before tax	248.4	243.9
Provision for income taxes	(34.7)	(36.3)
Net income (loss)	206.2	217.2
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	8.7	0.2
Reclassification out of Accumulated Other Comprehensive Income | Derivative instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	13.1	4.6
Provision for income taxes	(2.8)	(1.0)
Net income (loss)	10.3	3.6
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	(0.1)	(0.1)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of unrecognized net actuarial and other gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	(2.0)	(4.2)
Reclassification out of Accumulated Other Comprehensive Income | Pension and other postretirement benefits
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(2.1)	(4.3)
Provision for income taxes	0.5	0.9
Net income (loss)	(1.6)	(3.4)
Reclassification out of Accumulated Other Comprehensive Income | Foreign currency contracts | Derivative instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Costs of sales and services	14.3	3.3
Selling, general and administrative expenses	(1.7)	1.3
Reclassification out of Accumulated Other Comprehensive Income | Interest rate contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net	$ 0.5	$ 0.0