Significant Accounting Policies and Practices (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) partnership variable_interest_entity voting_interest_model_entity	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Significant Accounting Policies and Practices
Restricted cash and cash equivalents	$ 0.2		$ 0.2		$ 0.5
Allowance for doubtful accounts	5.2		$ 5.2		1.9	$ 1.0
Number of ownership interest entities | partnership			29
Equity earnings in related investments	0.2	$ 0.8	$ 1.0	$ 2.4
Deferred tax assets increased			65.1
Deferred tax assets	$ 75.7		$ 75.7		$ 10.6
ASU 2016-13
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, immaterial effect	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2020		Jan. 01, 2020
ASU 2017-04
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, immaterial effect	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2020		Jan. 01, 2020
ASU 2018-13
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, immaterial effect	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2020		Jan. 01, 2020
ASU 2018-15
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, immaterial effect	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2020		Jan. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected [Extensible List]			us-gaap:AccountingStandardsUpdate201815ProspectiveMember
ASU 2018-17
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, immaterial effect	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2020		Jan. 01, 2020
ASU 2018-18
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, immaterial effect	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2020		Jan. 01, 2020
ASU 2018-19
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, immaterial effect	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2020		Jan. 01, 2020
ASU 2019-04
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, immaterial effect	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2020		Jan. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected [Extensible List]			us-gaap:AccountingStandardsUpdate201904ProspectiveForDerivativesAndHedgingMember
ASU 2019-08
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, immaterial effect	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2020		Jan. 01, 2020
ASU 2020-02
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, immaterial effect	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2020		Jan. 01, 2020
ASU 2019-12
Significant Accounting Policies and Practices
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, immaterial effect	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2020		Jan. 01, 2020
Minimum
Significant Accounting Policies and Practices
Ownership interests percentage	30.00%		30.00%
Maximum
Significant Accounting Policies and Practices
Ownership interests percentage	50.00%		50.00%
Primary Beneficiary
Significant Accounting Policies and Practices
Number of ownership interest entities | variable_interest_entity			24
Not Primary Beneficiary
Significant Accounting Policies and Practices
Number of ownership interest entities | voting_interest_model_entity			5