Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Debt - Narrative (Details)	1 Months Ended		3 Months Ended		6 Months Ended
Debt - Narrative (Details)	Jun. 30, 2018 USD ($) extension	May 31, 2018 USD ($)	Jun. 30, 2018 USD ($) extension	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) extension	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2013
Debt Instrument [Line Items]
Balance availability under Credit Facilities	$ 1,745,300,000		$ 1,745,300,000		$ 1,745,300,000		$ 1,639,100,000
Line of credit facility amount outstanding	80,000,000		80,000,000		80,000,000		130,000,000
Letters of credit utilizing availability under Credit Facilities	406,500,000		406,500,000		406,500,000		462,700,000
Long-term debt	8,257,700,000		8,257,700,000		8,257,700,000		8,187,400,000
Principal amount	8,374,400,000		8,374,400,000		$ 8,374,400,000		8,281,700,000
Percentage of tax exempt financings					100.00%
Net interest income related to net swap settlements			500,000	$ 1,300,000	$ 1,400,000	$ 2,600,000
Gains (losses) on the change in fair value of the hedged senior notes			2,500,000	(1,400,000)	9,200,000	200,000
Gains (losses) on the related interest rate swaps			(2,700,000)	1,600,000	(9,500,000)	200,000
Interest Rate Locks
Debt Instrument [Line Items]
Terminated derivative, notional amount		$ 600,000,000
Notional value of swap agreements	$ 450,000,000		$ 450,000,000		$ 450,000,000
Derivative, interest rate floor	1.90%		1.90%		1.90%
Derivative, interest rate cap	2.95%		2.95%		2.95%
Accumulated and other comprehensive income (loss), net of tax	$ (12,200,000)		$ (12,200,000)	(3,400,000)	$ (12,200,000)	(3,400,000)
Effective portion of interest rate locks amortized as an adjustment to interest expense			300,000	$ 700,000	800,000	$ 1,300,000
Interest Rate Locks \| Fair Value, Measurements, Recurring
Debt Instrument [Line Items]
Interest rate swaps - other assets	23,900,000		23,900,000		23,900,000		19,100,000
Interest Rate Locks \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Interest rate swaps - other assets	23,900,000		23,900,000		23,900,000		19,100,000
Interest Rate Swap
Debt Instrument [Line Items]
Notional value of swap agreements	300,000,000		300,000,000		300,000,000
Interest rate swaps at fair value	(1,500,000)		(1,500,000)		(1,500,000)		8,000,000
Expected amortization of yield adjustment on senior notes					(600,000)
Interest Rate Swap \| Fair Value, Measurements, Recurring
Debt Instrument [Line Items]
Interest rate swaps - other assets							8,000,000
Interest Rate Swap \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Interest rate swaps - other assets							8,000,000
Line Of Credit Due May 2021
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 1,000,000,000
Line Of Credit Due June 2019
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 1,250,000,000.00
Long-term debt	0		0		0		130,000,000
Principal amount	0		0		0		130,000,000
Uncommitted Revolver
Debt Instrument [Line Items]
Long-term debt	44,700,000		44,700,000		44,700,000		0
Principal amount	44,700,000.0		44,700,000.0		44,700,000.0		0
Senior notes: May 2028
Debt Instrument [Line Items]
Long-term debt	781,900,000		781,900,000		781,900,000		0
Principal amount	$ 800,000,000		$ 800,000,000		$ 800,000,000		0
Interest rate	3.95%		3.95%		3.95%
Senior notes: May 2028 \| Interest Rate Locks
Debt Instrument [Line Items]
Proceeds from retirement of certain hedging relationships, net of fees paid to issue senior notes		$ 31,100,000.0
Senior notes: May 2018
Debt Instrument [Line Items]
Long-term debt	$ 0		$ 0		$ 0		699,700,000
Principal amount	$ 0		$ 0		$ 0		700,000,000
Interest rate	3.80%		3.80%		3.80%
Tax Exempt Bonds And Other Tax Exempt Financings
Debt Instrument [Line Items]
Long-term debt	$ 1,036,600,000		$ 1,036,600,000		$ 1,036,600,000		1,036,000,000
Principal amount	1,042,400,000		1,042,400,000		1,042,400,000		1,042,400,000
Capital Lease Obligations
Debt Instrument [Line Items]
Principal amount	106,400,000		106,400,000		106,400,000		108,400,000
Capital lease liabilities	106,400,000		106,400,000		106,400,000		108,400,000
Senior Notes $550.0 million 4.750% Due May 2023
Debt Instrument [Line Items]
Long-term debt	540,000,000		540,000,000		540,000,000		549,000,000
Principal amount	$ 550,000,000		$ 550,000,000		$ 550,000,000		550,000,000
Interest rate	4.75%		4.75%		4.75%				4.75%
Senior Notes $500.0 million 3.20% Due March 2025
Debt Instrument [Line Items]
Long-term debt	$ 495,500,000		$ 495,500,000		$ 495,500,000		495,200,000
Principal amount	$ 500,000,000		$ 500,000,000		$ 500,000,000		500,000,000
Interest rate	3.20%		3.20%		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	$ 11,600,000		$ 11,600,000		$ 11,600,000		$ (11,800,000)
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 2,250,000,000.00		$ 2,250,000,000.00		$ 2,250,000,000.00
Number of available extensions \| extension	2		2		2
Extension period	1 year
Facility feature, increase limit	$ 1,000,000,000.0		$ 1,000,000,000.0		$ 1,000,000,000.0