Derivatives - Interest Rate Swaps (Details) - USD ($) $ in Millions	3 Months Ended							6 Months Ended
	Jun. 30, 2022		Mar. 31, 2022	Jun. 30, 2021		Mar. 31, 2021		Jun. 30, 2022		Jun. 30, 2021
Derivatives
Tax expense				$ (1.1)		$ (1.1)				$ (2.2)
Unrealized gain on designated cash flow hedge	$ 0.0	[1]	$ 0.1	3.7	[1],[2]	$ 3.6	[3]	$ 0.1	[1]	7.3	[1]
Interest expense	0.0			4.8				0.1		9.6
Interest expense expected to be reclassified out of accumulated other comprehensive income (loss) over the next twelve months	0.1							0.1
Interest rate swaps
Derivatives
Change in fair value of interest rate swaps	0.0			4.8				0.1		9.5
Tax expense	0.0			(1.1)				0.0		(2.2)
Unrealized gain on designated cash flow hedge	$ 0.0			$ 3.7				$ 0.1		$ 7.3

[1] Includes tax expense of $1.1 million and $2.2 million for the three and six months ended June 30, 2021, respectively.

[2] Includes tax expense of $1.1 million.

[3] Includes tax expense of $1.1 million.