Derivative Instruments (Narrative) (Details) $ in Millions	1 Months Ended	3 Months Ended
Mar. 31, 2020 USD ($) Derivative	Mar. 31, 2020 USD ($) Derivative
Derivatives Fair Value [Line Items]
Net losses expected to be reclassified in to earnings over next 12 months		$ 8.3
Interest Rate Swaps [Member] \| Cash Flow Hedging [Member]
Derivatives Fair Value [Line Items]
Number of interest rate swap agreements \| Derivative	6	6
Interest Rate Swaps [Member] \| Cash Flow Hedging [Member] \| Minimum [Member]
Derivatives Fair Value [Line Items]
Swaps fixed interest rate	3.17%	3.17%
LIBOR variable interest rate	1.85%	1.85%
Interest Rate Swaps [Member] \| Cash Flow Hedging [Member] \| Maximum [Member]
Derivatives Fair Value [Line Items]
Swaps fixed interest rate	4.82%	4.82%
LIBOR variable interest rate	2.15%	2.15%
Interest Rate Swaps [Member] \| Cash Flow Hedging [Member] \| Term Loans [Member]
Derivatives Fair Value [Line Items]
Term loan debt	$ 397.5	$ 397.5
Interest Rate Swaps [Member] \| Cash Flow Hedging [Member] \| Term Loans Maturing in December 2020 through January 2029 [Member]
Derivatives Fair Value [Line Items]
Term loan debt	$ 653.5	$ 653.5
Term loan maturity period, start	2020-12
Term loan maturity period, end	2029-01
Interest Rate Swaps [Member] \| Cash Flow Hedging [Member] \| Term Loans Maturing in December 2020 through January 2029 [Member] \| Minimum [Member]
Derivatives Fair Value [Line Items]
Swaps fixed interest rate	0.85%	0.85%
Interest Rate Swaps [Member] \| Cash Flow Hedging [Member] \| Term Loans Maturing in December 2020 through January 2029 [Member] \| Maximum [Member]
Derivatives Fair Value [Line Items]
Swaps fixed interest rate	1.17%	1.17%

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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Fixed interest rate related to the interest rate derivative.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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