Basis of Presentation - Changes to Quarterly Results: Cash Flow Statement (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020		Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net cash provided by (used in) operating activities	$ 168.2	$ 5.1	[1]	$ 127.7	$ 130.7	$ 205.0
Net cash provided by (used in) investing activities	(637.9)	(34.0)	[1]	(68.5)	(112.3)	(133.3)
Net cash provided by (used in) financing activities	$ 290.1	103.9	[1]	(48.7)	196.2	188.6
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net cash provided by (used in) operating activities		0.5		114.4	118.4	195.6
Net cash provided by (used in) investing activities		(35.6)		(65.0)	(108.9)	(134.3)
Net cash provided by (used in) financing activities		103.9		(48.0)	196.0	189.3
Increase (Decrease)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net cash provided by (used in) operating activities		4.6		13.3	12.3	9.4
Net cash provided by (used in) investing activities		1.6		(3.5)	(3.4)	1.0
Net cash provided by (used in) financing activities		$ 0.0		$ (0.7)	$ 0.2	$ (0.7)

[1] See discussion in Note 1 - Basis of Presentation for further detail regarding the elimination of the International lag reporting.