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Debt - Narrative (Details)	1 Months Ended	3 Months Ended
Debt - Narrative (Details)	Jun. 30, 2018	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) extension	Dec. 31, 2013
Debt Instrument [Line Items]
Balance availability under Credit Facilities		$ 1,696,500,000		$ 1,694,100,000
Line of credit facility amount outstanding		160,000,000.0		159,000,000.0
Letters of credit utilizing availability under Credit Facilities		$ 376,200,000		379,600,000
Percentage of tax exempt financings		100.00%
Present value of lease liabilities		$ 108,500,000
Gains (losses) on the change in fair value of the hedged senior notes		3,400,000	$ 6,800,000
Gains (losses) on the related interest rate swaps		3,400,000	6,800,000
Interest rate swaps		12,500,000		0
Interest Rate Locks
Debt Instrument [Line Items]
Notional value of swap agreements		750,000,000.0		725,000,000.0
Gains (loss) recognized in other comprehensive income, net of tax		(11,300,000)	$ 18,300,000
Interest Rate Locks \| Fair Value, Measurements, Recurring
Debt Instrument [Line Items]
Interest rate swaps - other assets		7,400,000		10,300,000
Interest Rate Locks \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Interest rate swaps - other assets		7,400,000		10,300,000
Interest rate swaps		12,500,000
Interest Rate Swap
Debt Instrument [Line Items]
Notional value of swap agreements		300,000,000.0		300,000,000.0
Interest rate swaps at fair value		5,900,000		2,500,000
Expected amortization of yield adjustment on senior notes		800,000
Interest Rate Swap \| Fair Value, Measurements, Recurring
Debt Instrument [Line Items]
Interest rate swaps - other assets		5,900,000		2,500,000
Interest Rate Swap \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Interest rate swaps - other assets		5,900,000		2,500,000
Line of Credit Due May 2021
Debt Instrument [Line Items]
Maximum borrowing capacity				1,000,000,000.0
Line of Credit Due June 2019
Debt Instrument [Line Items]
Maximum borrowing capacity				1,250,000,000
Long-term debt		0		0
Uncommitted Revolver
Debt Instrument [Line Items]
Long-term debt		87,300,000		33,400,000
Senior notes: May 2028
Debt Instrument [Line Items]
Long-term debt		$ 783,100,000		782,700,000
Interest rate		3.95%
Tax Exempt Bonds And Other Tax Exempt Financings
Debt Instrument [Line Items]
Long-term debt		$ 1,036,900,000		1,036,800,000
Senior Notes $550.0 million 4.750% Due May 2023
Debt Instrument [Line Items]
Long-term debt		$ 548,000,000.0		544,500,000
Interest rate		4.75%			4.75%
Senior Notes $500.0 million 3.20% Due March 2025
Debt Instrument [Line Items]
Long-term debt		$ 495,900,000		495,700,000
Interest rate		3.20%
Senior Notes $500.0 million 3.20% Due March 2025 \| Interest Rate Locks
Debt Instrument [Line Items]
Accumulated and other comprehensive income (loss), net of tax		$ 11,000,000.0		11,200,000
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 2,250,000,000
Number of available extensions \| extension				2
Extension period	1 year
Facility feature, increase limit				$ 1,000,000,000.0
Minimum \| Interest Rate Locks
Debt Instrument [Line Items]
Derivative, interest rate cap		1.90%
Minimum \| Tax Exempt Bonds And Other Tax Exempt Financings
Debt Instrument [Line Items]
Interest rate		195.00%
Minimum \| Finance leases: 2019-2046
Debt Instrument [Line Items]
Interest rate		307.00%
Maximum \| Interest Rate Locks
Debt Instrument [Line Items]
Derivative, interest rate cap		3.25%
Maximum \| Tax Exempt Bonds And Other Tax Exempt Financings
Debt Instrument [Line Items]
Interest rate		250.00%
Maximum \| Finance leases: 2019-2046
Debt Instrument [Line Items]
Interest rate		1220.30%