Long-Term Debt (Details) - USD ($)			6 Months Ended
	Dec. 17, 2021	Oct. 17, 2018	Jun. 30, 2022	Dec. 31, 2021	Oct. 31, 2018
Line of Credit Facility
Long-term debt			$ 891,200,000	$ 976,600,000
Short-term debt			99,700,000	$ 149,300,000
364-Day Facility | Line of Credit
Line of Credit Facility
Line of credit facility, maximum borrowing capacity	$ 150,000,000
Short-term debt			$ 100,000,000
364-Day Facility | Line of Credit | LIBOR
Line of Credit Facility
Variable rate on debt (as a percent)			1.50%
364-Day Facility | Line of Credit | Base Rate
Line of Credit Facility
Variable rate on debt (as a percent)			0.50%
Line of Credit
Line of Credit Facility
Senior notes	1,007,500,000
Maximum borrowing capacity expansion threshold	$ 275,000,000
Maximum borrowing capacity expansion threshold, percent (as a percent)	100.00%
Line of Credit | Revolving Credit Facility
Line of Credit Facility
Credit facility maximum availability (in years)	5 years
Line of credit facility, maximum borrowing capacity	$ 400,000,000
Line of credit facility, unused capacity, commitment fee (as a percent)			0.225%
Credit facility borrowing capacity			$ 294,200,000
Letter of credit outstanding			10,800,000
Long-term debt			$ 95,000,000
Line of Credit | Revolving Credit Facility | LIBOR
Line of Credit Facility
Variable rate on debt (as a percent)			1.75%
Line of Credit | Revolving Credit Facility | Base Rate
Line of Credit Facility
Variable rate on debt (as a percent)			0.75%
Line of Credit | Term Loan | LIBOR
Line of Credit Facility
Variable rate on debt (as a percent)			1.75%
Line of Credit | Term Loan | Base Rate
Line of Credit Facility
Variable rate on debt (as a percent)			0.75%
Line of Credit | Term Loan A-1
Line of Credit Facility
Senior notes			$ 150,000,000
Line of credit facility, maximum borrowing capacity	$ 142,500,000
Debt instrument, periodic payment, years one to three, percentage of principal (as a percent)			2.50%
Debt instrument, periodic payment, years two, percentage of principal (as a percent)			5.00%
Debt instrument, periodic payment, years three, percentage of principal (as a percent)			1.25%
Long-term debt			$ 139,700,000
Line of Credit | Term Loan A-2
Line of Credit Facility
Credit facility maximum availability (in years)	5 years
Line of credit facility, maximum borrowing capacity	$ 315,000,000
Debt instrument, periodic payment, years one to three, percentage of principal (as a percent)			2.50%
Debt instrument, periodic payment, years two, percentage of principal (as a percent)			5.00%
Debt instrument, periodic payment, years three, percentage of principal (as a percent)			1.25%
Long-term debt			$ 311,100,000
Senior Notes
Line of Credit Facility
Senior notes		$ 350,000,000
Interest rate (as a percent)		5.75%			5.875%
Aggregate principal amount redeemed					$ 450,000,000
Senior Notes | Before October 15, 2021
Line of Credit Facility
Redemption price (as a percent)		100.00%