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Supplemental Cash Flow Information - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2020	Mar. 19, 2020	Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]
Amount deposited with trustee, sufficient to fully pay redemption price, reported in restricted cash in current assets on balance sheet	$ 487.3		$ 0.0
Senior Notes | The Notes
Restricted Cash and Cash Equivalents Items [Line Items]
Amount deposited with trustee, sufficient to fully pay redemption price, reported in restricted cash in current assets on balance sheet	487.3	$ 487.3
Principal Amount Due | Senior Notes | The Notes
Restricted Cash and Cash Equivalents Items [Line Items]
Amount deposited with trustee, sufficient to fully pay redemption price, reported in restricted cash in current assets on balance sheet	$ 440.0

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+ References

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Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765

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