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Property and Equipment - Textual (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) transaction	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Feb. 29, 2016 renewal_option
Property, Plant and Equipment [Line Items]
Percentage of property and equipment, net pledged to lenders under credit agreement (percent)	70.00%
Financing obligation liability	$ 263.8	$ 271.5
Estimate of total financing obligation liability	871.2
Rental income from subleases	3.0	2.9	$ 4.1
Total expected future minimum rentals	$ 2.6
Number of sale/leaseback transactions | transaction	3
Future minimum payments under lease back transaction, due 2019	$ 7.5
Future minimum payments under lease back transaction, due 2020	7.5
Future minimum payments under lease back transaction, due 2021	7.6
Future minimum payments under lease back transaction, due 2022	7.5
Future minimum payments under lease back transaction, due 2023	6.8
Future minimum payments under lease back transaction, due thereafter	$ 82.2
Minimum [Member]
Property, Plant and Equipment [Line Items]
Lease term	1 year
Maximum [Member]
Property, Plant and Equipment [Line Items]
Lease term	20 years
Development / Lease Agreement [Member]
Property, Plant and Equipment [Line Items]
Lease term				15 years
Number of lease renewal options available | renewal_option				4
Term of lease renewal options				5 years
Increase in Property and equipment, net	$ 55.0	49.8
Long-term Debt, Net of Current Portions [Member] | Development / Lease Agreement [Member]
Property, Plant and Equipment [Line Items]
Financing obligation liability	54.8	49.5
Financing obligation liability, current	$ 0.2	$ 0.3

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Number of renewal options as part of the development/lease agreement for the new corporate headquarters.

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Total number of sale/leaseback transactions in which the Company is involved as of the balance sheet date.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Amount of minimum lease payments for sale-leaseback transactions accounted for using the deposit method or as a financing due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for sale-leaseback transactions accounted for using the deposit method or as a financing due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Contractually required future rental payments receivable on noncancelable subleasing arrangements.

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Amount of increase (decrease) of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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