Income Taxes (Schedule of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Unrecognized tax benefit — beginning of year	$ 322.9	$ 391.1	$ 92.1		$ 96.3
Additions for current year tax positions	0.0		13.4	$ 0.0
Additions for prior year tax positions	0.0		35.7	154.9
Reductions for prior year tax positions	(9.1)		(5.2)	(11.7)
Settlements	(47.3)		(8.9)	(112.5)
Reductions due to expirations of statute of limitations	(7.0)		0.0	$ (34.9)
Unrecognized Tax Benefits, Decrease Resulting from Acquisition	(4.8)
(Reduction) addition due to acquisition		264.0	0.0
Unrecognized tax benefit — end of year	$ 322.9	$ 391.1	$ 92.1