Leases - Amounts recognized in Condensed Consolidated Balance Sheet (Details) $ in Millions	Mar. 31, 2019 USD ($)
Leases [Abstract]
Finance lease assets	$ 670.9
Finance lease liabilities	709.9
Accumulated amortization	$ 65.3

Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

Name:	us-gaap_FinanceLeaseLiabilityNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant