Basis of Presentation - Changes to Quarterly Results: Cash Flow Statement (Details) - USD ($) $ in Millions	6 Months Ended			9 Months Ended	12 Months Ended
	Jun. 30, 2021	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	$ 292.5	$ 127.7	[1]	$ 130.7	$ 205.0
Net cash provided by (used in) investing activities	(749.0)	(68.5)	[1]	(112.3)	(133.3)
Net cash provided by (used in) financing activities	$ 281.4	(48.7)	[1]	196.2	188.6
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net cash provided by (used in) operating activities		114.4		118.4	195.6
Net cash provided by (used in) investing activities		(65.0)		(108.9)	(134.3)
Net cash provided by (used in) financing activities		(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		13.3		12.3	9.4
Net cash provided by (used in) investing activities		(3.5)		(3.4)	1.0
Net cash provided by (used in) financing activities		$ (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.