Supplemental Financial Data - Other Income (Expense) - Net (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended			12 Months Ended
	Feb. 07, 2019		Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019
Disclosure Text Block Supplement [Abstract]
Non-operating pension income (expense)	$ (85.7)					$ 53.7	$ 46.2		$ 36.5
Change in fair value of make-whole derivative liability	0.0			$ (102.6)	$ 69.8	0.0	(32.8)	[1]	(172.4)	[1]
Debt redemption premium	0.0		$ (25.5)	$ (41.3)		(29.5)	(50.1)		0.0
Miscellaneous other income (expense) – net	(0.3)					(9.3)	25.1		(17.6)
Other income (expense) – net	(86.0)	[2]				14.9	(11.6)	[2]	(153.5)	[2]
Pension settlement charge	$ 85.8					$ 0.0	$ 0.6	[1]	$ 0.0	[1]

[1] See Note 1 Basis of Presentation and Description of Business for further detail regarding the elimination of the International lag reporting

[2] See Note 1 Basis of Presentation and Description of Business for further detail regarding the elimination of the International lag reporting.