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Segment Information (Narrative) (Details) $ in Millions			3 Months Ended								12 Months Ended
	Mar. 31, 2020 USD ($) customer	Mar. 31, 2019 USD ($) customer	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	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, 2020 USD ($) customer	Mar. 31, 2019 USD ($) customer	Mar. 31, 2018 USD ($) customer
Concentration Risk [Line Items]
Revenues			$ 944.3	$ 998.5	$ 983.5	$ 963.6	$ 913.7	$ 933.2	$ 901.0	$ 932.7	$ 3,890.0	$ 3,680.5	$ 4,129.1
Customer Concentration Risk | Sales Revenue, Net
Concentration Risk [Line Items]
Number of customers over 10% threshold | customer											1	1	1
Revenues											$ 438.6	$ 401.9	$ 413.2
Customer Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Number of customers over 10% threshold | customer	1	2
Percentage of consolidated gross accounts receivable attributable to customer over threshold	11.00%	31.00%
Accounts receivable, gross	$ 82.0	$ 269.9	$ 82.0				$ 269.9				$ 82.0	$ 269.9

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

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