Fair Value Disclosures (Non-Pension Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset		$ 33.3	$ 9.5
Total Assets, Fair Value Disclosure, Recurring		48.0	16.4
Derivative Liability, Fair Value, Gross Liability		36.8	13.5
Total Liabilities, Fair Value Disclosure, Recurring		36.8	13.5
Cash and cash equivalents		587.5	274.8	$ 199.4	$ 226.3
Other assets		383.6	273.4
Investment Securities, Including Mutual Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		14.7	6.9
Cash and Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		7.9	2.0
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset		0.0	0.0
Total Assets, Fair Value Disclosure, Recurring		4.8	4.5
Derivative Liability, Fair Value, Gross Liability		0.0	0.0
Total Liabilities, Fair Value Disclosure, Recurring		0.0	0.0
Fair Value, Inputs, Level 1 [Member] | Investment Securities, Including Mutual Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	[1]	4.8	4.5
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset		33.3	9.5
Total Assets, Fair Value Disclosure, Recurring		43.2	11.9
Derivative Liability, Fair Value, Gross Liability		36.8	13.5
Total Liabilities, Fair Value Disclosure, Recurring		36.8	13.5
Fair Value, Inputs, Level 2 [Member] | Investment Securities, Including Mutual Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	[1]	9.9	2.4
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset		0.0	0.0
Total Assets, Fair Value Disclosure, Recurring		0.0	0.0
Derivative Liability, Fair Value, Gross Liability		0.0	0.0
Total Liabilities, Fair Value Disclosure, Recurring		0.0	0.0
Fair Value, Inputs, Level 3 [Member] | Investment Securities, Including Mutual Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		0.0	0.0
Supplemental Executive Retirement Plan [Member] | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets		$ 6.8	$ 4.9

[1] The values of investment securities, including mutual funds, are classified as cash and cash equivalents ($7.9 million and $2.0 million as of December 31, 2016 and 2015, respectively) and other assets ($6.8 million and $4.9 million as of December 31, 2016 and 2015, respectively). For mutual funds that are publicly traded, fair value is determined on the basis of quoted market prices and, accordingly, these investments have been classified as Level 1. Other investment securities are valued at the net asset value per share or unit multiplied by the number of shares or units held as of the measurement date and have been classified as Level 2.