Leasing (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense		$ 35,700,000	$ 35,200,000
Operating Lease, Right-of-Use Asset	$ 114,100,000	0		$ 114,100,000
Document Period End Date	Dec. 31, 2019
Operating Lease, Weighted Average Remaining Lease Term	5 years 3 months 18 days
Operating Lease, Payments	$ 35,600,000	0	$ 0
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	31,700,000
Finance Lease, Right-of-Use Asset, Amortization	1,200,000
Lease, Cost	37,800,000
Finance Lease, Liability, Payments, Due Next Twelve Months	1,100,000
Lessee, Operating Lease, Liability, Payments, Due Year Two	22,500,000
Finance Lease, Liability, Payments, Due Year Two	1,100,000
Lessee, Operating Lease, Liability, Payments, Due Year Three	16,600,000
Finance Lease, Liability, Payments, Due Year Three	1,000,000.0
Lessee, Operating Lease, Liability, Payments, Due Year Four	11,800,000
Finance Lease, Liability, Payments, Due Year Four	300,000
Lessee, Operating Lease, Liability, Payments, Due Year Five	7,800,000
Finance Lease, Liability, Payments, Due Year Five	0
Lessee, Operating Lease, Liability, Payments, Due after Year Five	20,000,000.0
Finance Lease, Liability, Payments, Due after Year Five	0
Lessee, Operating Lease, Liability, Payments, Due	110,400,000
Finance Lease, Liability, Payment, Due	3,500,000
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	10,800,000
Finance Lease, Liability, Undiscounted Excess Amount	100,000
Operating Lease, Liability	99,600,000
Finance Lease, Liability	3,400,000
Finance Lease, Principal Payments	1,600,000
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	58,600,000
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 2,000,000.0
Finance Lease, Weighted Average Remaining Lease Term	3 years 3 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	3.87%
Finance Lease, Weighted Average Discount Rate, Percent	2.55%
Operating Lease, Liability, Current	$ 28,300,000	0		29,800,000
Operating Lease, Liability, Noncurrent	$ 71,300,000	$ 0		$ 69,700,000