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Redeemable Noncontrolling Interest (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended			12 Months Ended
		Apr. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019	Dec. 31, 2019
Redeemable Noncontrolling Interest [Line Items]
Acquisition of additional shares of ARX Holding Corp.					$ 243.0		$ 11.2
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance, beginning of period					225.6	[1]	214.5	$ 214.5
Net income attributable to NCI			$ 0.0	$ 1.9	0.0		5.9	9.7
Other comprehensive income (loss) attributable to NCI1			0.0	0.9	0.0		5.8	4.6
Exercise of employee stock options					16.0		7.7	7.7
Purchase/change of ARX minority shares					(241.6)		(11.2)	(11.2)
Change in redemption value of NCI					0.0		0.2	0.3
Balance, end of period	[1]		$ 0.0	$ 222.9	$ 0.0		$ 222.9	$ 225.6
ARX Holding Corp.
Redeemable Noncontrolling Interest [Line Items]
Acquisition of additional shares of ARX Holding Corp.		$ 243.0
[1] See Note 12 – Redeemable Noncontrolling Interest for further discussion.

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Stock Issued During Period, Value, Stock Options Exercised Attributable to Redeemable Noncontrolling Interest

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