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Capital Stock, Accumulated Other Comprehensive Loss and Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Schedule of Share Repurchases | Share repurchases are shown below (in millions except for shares and per share amounts):
For the Year Ended December 31 | Aggregate Repurchases (1) |  | Cash paid for Repurchases |  | Number of Shares |  | Average Price per Share (2)
2018 | $ | 705.2 |  |  | $ | 704.9 |  |  | 4,308,418 |  | $ | 163.69 |
2017 | $ | 454.4 |  |  | $ | 450.5 |  |  | 3,014,131 |  | $ | 150.77 |
2016 | $ | 658.8 |  |  | $ | 658.8 |  |  | 5,816,363 |  | $ | 113.26 |
(1) 2018 includes $5.1 million of purchases prior to the increased authorization (2) Excludes commissions
Summary of Changes in Accumulated Other Comprehensive Loss, Net of Tax | A summary of changes in accumulated other comprehensive loss, net of tax is shown below (in millions):
For the year ended December 31, | 2018 |  | 2017 |  | 2016
Defined benefit plans: |  |  |  |  |
Balance at beginning of year | $ | (184.0 | ) |  | $ | (192.8 | ) |  | $ | (194.6 | )
Reclassification adjustments (net of tax expense of $2.4 million in 2018, $1.1 million in 2017 and $12.1 million in 2016) | 9.0 |  |  | 4.9 |  |  | 25.9 |
Other comprehensive income (loss) recognized during the period (net of tax benefit (expense) of ($0.6) million in 2018, ($0.4) million in 2017 and $5.0 million in 2016) | 2.2 |  |  | 3.9 |  |  | (24.1 | )
Balance at end of year | $ | (172.8 | ) |  | $ | (184.0 | ) |  | $ | (192.8 | )
Derivative instruments and hedging activities: |  |  |  |  |
Balance at beginning of year | $ | (22.9 | ) |  | $ | (45.1 | ) |  | $ | (38.7 | )
Reclassification adjustments (net of tax benefit (expense) of $4.1 million in 2018, ($3.1) million in 2017 and ($28.8) million in 2016) | (15.2 | ) |  | 6.4 |  |  | 57.9 |
Other comprehensive income (loss) recognized during the period (net of tax benefit (expense) of ($7.4) million in 2018, ($12.8) million in 2017 and $32.7 million in 2016) | 28.4 |  |  | 15.8 |  |  | (64.3 | )
Balance at end of year | $ | (9.7 | ) |  | $ | (22.9 | ) |  | $ | (45.1 | )
Cumulative translation adjustments: |  |  |  |  |
Balance at beginning of year | $ | (306.5 | ) |  | $ | (597.7 | ) |  | $ | (496.8 | )
Other comprehensive income (loss) recognized during the period (net of tax benefit of $2.3 million in 2018, $— million in 2017 and $1.1 million in 2016) | (216.8 | ) |  | 291.2 |  |  | (100.9 | )
Balance at end of year | $ | (523.3 | ) |  | $ | (306.5 | ) |  | $ | (597.7 | )

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